If you get another machine, I would recommend an AutoPAP. These can be set at a continuous mode (CPAP) so you get the best of both worlds. The APAP adjust itself contantly based on it detecting AHI events. Unfortunately, it will ramp pressure up due to mask leaks as well. Mine is set at 8 low, and 16 high. I wake up every time mask leaks, and pressure starts to ramp up.
I have a Resmed Autoset APAP and it has a feature, Easy-Breathe expiratory pressure relief (EPR) , that lowers the exhalation pressure, somewhat like a BiPAP. However, this caused the full face masked to seem to "jump" on my face each time the pressure slacked on and off with each breath. Fortunately, its user adjustable, so I set it down to level 1.
My problems were solved when I went to nasal pillows. I was a mouth breather, heavy snorer, and the sleep tech always told me I needed a full fask mask. I paid out of pocket for my own set of nasal pillows and its perfect. Nasal Pillows comes with small, medium, and large pillows so fit is perfect. It doesnt jump when I breath. I set EPR back to level 3 as a result. Ramp time down to 5 min since its so comfortable. No leaks ever. For me, pressure is at 8, and every morning I wake up, the highest I have seen the pressure is 8.4, whereas I saw 15 with full fask mask. Sleep tech said I needed a chin strap, but I havent worn it and don't seem to have a problem now keeping my mouth shut. This is something you can learn.