Just noticed a recent post where overnight titration was NOT performed. Too bad, that may have been of help, but I am SURE that others here
will assist you in getting that AHI way down. The therapy is 100% effective, once things are tuned right and on correct machine for condition.
Best wishes, clearyt!
p.s. I think the changing of masks and still not having acceptable results make it more of a red-herring issue. It's the settings on the machine, the wrong type of machine, or both, IMHO, that's the problem.