My pulmonologist- sleep specialist encourages us to self adjust during times of illness and allergies. With children as young as my son (5). Every growth spurt can and often does increase demands. As a result he has to have sleep studies at least 2 times a year and we have to adjust in small steps in between. So far we have not been off. The other thing to note is that the computer that sets your sleep study doesn't continue to up the pressure til events are gone.. only til events are 5 or less and hour. If you have 5 bad events an hour you will still feel horrible despite using a CPAP. As a result or MD advises the 2 week adjustment phases of .5 on the CPAP until you wake rested.
In his experience most feel and function better after sleeping on a CPAP at pressures 2-4 times higher than computationally determined. They manually overrided the computer last time i had a study and sure enough it was 10.8 before all my events went away. 9 or less and I woke once an hour. But YES do not just raise your CPAP with out first calling and talking with your MD. Boosting your self a point or two gradually over time shouldn't damage your lungs a bit. However you should get your MD/his respiratory nurses opinion on this...
My son is due his next titration in a month. He has went up 2 points since his last 1. I will let you all know what the next study says.

He is already beginning to show irritation, frustration, and mood volatility coming back after his last bump three days ago. We have to let it ride and see how well he adjusts.
Sleeping on ones side is preferred less weigh on the lungs and no risk of tongue collapse and obstruction. You can train yourself to stay on your side with pillows and as a last resort a balls sewn into pockets on the back of your PJs. You most likely only need a 1-2 point total increase. I doubt that your MD will have a problem with a point or to bump up. Mine is fine with me holding at 11.
MG