As far as changing the pressure, the "official line" is that you can't change the pressure on your own, but in reality you can and your insurance company doesn't care, not even one little bit. However, this is a complex case, and it shouldn't be done willy nilly. It is a medical prescription--changing pressures is akin to changing the doses of your medication without your doctor's OK. You may come to a point where you decide to do that from a place of knowledge with the data and a good understanding of what you're doing, but let's see if we can get your brother comfortable with the titrated settings first.the woman at the supply place said that the pressure has to be dictated by the prescription, and since his prescription is for 17, we can't start it at lower and still have the insurance company pay for the equipment (and we can't afford it on our own). He's doing that ramp feature, and someone suggested yesterday "auto setting from 12-17", so we're looking in to if we can have the prescription switched to that. It would make more sense to do it the other way though, so it's frustrating that we have the insurance stuff hanging over our heads...
As for "auto setting from 12 - 17", his current machine CANNOT be set up that way--it requires an autopap, called an Autoset in the ResMed line. The Elite is a fixed pressure machine--although it will ramp, it holds one pressure once it reaches that pressure. They should have given him an auto in the first place given the complexities of this case, but it would be a big fight to swap out machines at this point (if you're interested in trying see "Help, I'm stuck with a Brick" in my signature below. Everything points to the fact that the DME you've been using is more interested in helping their own pocket than helping your brother be successful at this therapy.
The Fit Life might be a very good mask for your brother, but some people find their head isn't the right shape to keep it leak free--sigh, it's always something. If you learn how to read the data you'll see how much leakage there is and when it typically occurs. It's after the fact, but gives you the opportunity to tweak a little bit until it's just right.
Hang in there--you're doing a great job!