Duct tape, bungee cords, and cable ties? I had the same problem when I first started and ended up trying 3 or 4 different masks until I found one that didn't drive me crazy. I couldn't stand anything over my mouth or a chin strap of any kind and would rip off the mask after a couple of hours sleep. ...

There are several good posts on this forum describing AHI, HI, and AI numbers. So a search for AHI and you should find them. I'm too new a user to give you any cpap or mask advice, but I can tell you that changing the pressure from 9 to 10 should not make any difference as it's too small a change.