I was going to try to PM you to ask a couple more Discus-y questions however I can't see the means to do so - it may be because I haven't had my coffee yet...
You have said some interesting things, and things I have wondered myself - mostly; have people been too "gentle" with Discus and set them up for failure with this level of coddling? Are some of these issues appearing because of how "perfect" they are being kept? I have seen some beautiful discus kept in so called inadequate conditions, still growing big, still breeding - just not quite as big and round as when kept in immaculate conditions. I do feel a little sad for the fish that looks gorgeous but has nothing but a BB glass box to play in. I like seeing natural behaviours.
If I went Discus, I think I would try to keep their diet fish based with perhaps the occasional beefheart treat. I have heard salmon fillet is a good way to go.. would be more than happy to have a constant supply of it coming into the house
Thanks for your comments - I had put Discus into the "too much work for now," category, but I am rethinking it now - I guess at the end of the day, it can't hurt to try and to get a feel for them, and if it goes wrong it will be a terrible shame and I will learn and move on, or if it does end up being too much work there is always someone else out there looking for discus

I will continue to have my constant internal debate until the tank arrives and I can actually stick something in there!
Imo what you're currently doing for water changes should work for discus, assuming a few simple and reasonable things most fish appreciate: not overcrowding, not overfeeding, reasonable filter maintenance, good nutrition, tankmates that don't harass them or stress them out (if you want tankmates), and reasonably healthy individuals to begin with. One thing I did subscribe to was feeding them as grazers, a few small feedings per day in preference to one or two large feedings, even as adults.
When I kept mine in the low to mid 6s pH, my water was such that I was lowering pH to get there. If your water naturally settles there, that in itself shouldn't be a problem imo if your regimen already includes keeping actual tank pH fairly stable.
Beyond that I have to touch on approach, which is where people differ-- so my disclaimer here is the following might reflect some philosophical differences I have with certain demographics in the discus world.
I wouldn't think keeping them in excellent conditions actually harms them as much as:
The constant medicating some people do-- How can this be good? Meds have their place, but there's literature out there indicating an immune suppressing effect for some fish meds (I wouldn't have a list in my head). Keep hammering a fish's immune system, healthy gut bacteria, etc. with meds and they wonder why their fish get sick a lot? But it's worse than that, there's a good bit of aquaculture literature concerning the overuse of anti-biotics creating resistant fish diseases.
Overfeeding, obsession with 'high protein' and fast growth, trophy sizes, and somewhat arbitrary or artificial standards of 'perfection'. The feeding debate will go on and on imo-- beef heart, what enzymes discus have and what that does or doesn't mean., protein requirements, etc. There's at least 3 studies (or topics) fairly well known in some discus circles-- one involves a 12 week study with results that young, growing discus grew fastest during that span on 45-50% protein-- a lot has been made of this by some, but, this is actually similar to fry or juvies of many species, it doesn't tag discus as having exceptional protein requirements. It certainly doesn't prove they specifically need beef protein vs protein sources in their natural habitat.
Another involves wild discus stomach contents and has been undertaken by more than one source with generally similar findings: discus diet varies according to season and habitat where each species is found, and generally includes a lot of detritus, plant material, algae, aquatic invertebrates, some bugs, and in that general order, with detritus and plant material swapping places according to season, blue/brown discus consuming a higher % of aquatic invertebrates than other types. You can, and people do, debate what this means for protein consumption of wild discus, but nothing here hints at land animal protein, beyond a limited % of bugs. Objectively, what's on the side of land animal protein is simply the fact that discus keepers who use it have found they eat it and grow on it and it's been used for years.
A third is a study of protein enzymes in discus digestion, used by some to argue that they're capable of digesting beef heart.
My view is, whatever your opinion or choices and however they work for you, they don't
need land animal protein, which is fact, not opinion, and is separate from a debate over whether they
can have land animal protein. Setting that aside and going back to overfeeding and the obsession of some people with fast growth-- I simply find it's not necessary to get good sized, healthy adults, and there's a good amount of science out there that says overfeeding and overdoing protein actually slows growth, creates food assimilation inefficiencies, produces more nitrogen wastes, etc.
On what I consider somewhat artificial notions of 'perfection'... People have their preferences in this area and judges at a show have their criteria. Fine. But a discus doesn't have to have the 'perfect' profile, zero peppering, and whatever else to be a nice, big, healthy, beautiful fish. As I've related elsewhere, in the early days of pigeon blood discus I saw a pigeon blood strain the NY breeder called 'royal king'. To this day they're maybe the most impressive and beautiful discus I've seen, certainly the largest, and they had spectacular color... and they had some peppering.
Are there weaker strains today, actually requiring 'perfect' care? If so, I'd suspect overbreeding to produce novel color variations-- don't know, have they created some EBJD-like strains of discus? Another possibility is overusing meds (maybe just certain meds) while growing them to saleable sizes damages their immune system or other developmental factors. A documented example of an issue with meds and fry I've seen found an issue with swim bladder inflation in angelfish fry with meth blue at certain percentages.
--Don't know how much all that long-windedness helps you, lol. As I say, there's more than one approach to certain aspects of keeping them. Bottom line for me is, yes, discus are something of a commitment, but not near so bad as some people make them out to be. Or at least they needn't be. Some of that is in your methods of keeping them.