I made my first AIO (i've only made fitteds and pockets) (True aIO anyway)
Anyway I used outer PUL, inner OV and 6 layer soaker inside.
Is 7 layers of Ov enough? I am drying it now to seal it.

I haven't used OV, but I've used regular velour, and that sounds like enough to me. I have a Luke's Drawers AIO with snap-in velour soaker (it's a slightly rougher velour though), and it's just 2 layers, so when you tri-fold, you have 6 layers. It holds a decent amount.

I made a doubler for it so now it is 11 layers of OV that thing should hold for 2-3 hours for sure. I'm going to try organioc cotton fleece today.