Couldn't sleep last night thinking about this tank seal.
Got up at midnight and trotted downstairs for a quick inspection. All good.
This morning I was awoken to a gentle nudge and my wife's voice saying the same damn thing she said a couple times before.
I raced in my skivvies to the bottom of the stairs and swung the door open.
The leak is tiny (relative to what 800g tanks are capable of) but it's there.
The tank is draining now and I'll have the filters broken down in an hour.
This can't be so difficult. I've resealed several tanks before including this one and NEVER had this kind of problem.
If I hit this at full throttle it'll still be another month.
Bummer.