You can adjust the ramp time, humidity settings, and EPR all you want. These are comfort features.
If I were you I'd make those adjustments based on comfort alone.
One night, or even just a few nights, of data should not be the basis of any adjustments you make.
I would see about possibly using a needle and thread, though, to see if I could cinch up that chin strap a bit.
My advice is to just hang in there and be glad for the progress you've made so far.
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