Keep pulling mask off after 2 hrs

[throwaway1242]

Need some help as a new user. I keep pulling the mask off after 2 hours. 
Pressure: 7.8-8
EPR:3

Any pressure increase from 8 results to a ton of central apneas.
The leak rate is high near the time when mask is pulled
   

[G. Szabo]

Lower EPR lowers the occurrences of CAs. You can set it to 1 or 2 and see the effect. 
However, your problem is with the leaks. This could be the reason that you took off the mask. It does not seem that the pressure causes the leaks because the pressure has not changed much. You probably changed your position and misaligned your mask. You might need to tighten the straps or use a different mask. 
Tape your mouth; do not use the ramp.

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[SarcasticDave94]

It seems to me in part to be a mask adjustment issue. You may need to use higher pressure just to adjust it properly.

It's hard for me to tell, the leak pattern could be the mask only, and some did seem to be that with the somewhat spikey look.

Proper size and adjustment, the P10 should be easily able to handle your Max machine pressure of 20.

You may have to change cushion size to address this too.