Okay, I'll reply to everyone one by one (I actually have no idea how to properly use a forum, so if I'm doing it wrong, please let me know!)
Zonk : The reason why I use fixed pressures most of the time is because I was getting absolutely TERRIBLE results when using the 6-20 initial settings I had, My AHI was over 7 on average, and my leaks were around 40L/minute. She considered the treatment was not working at all, even saying I was worse on CPAP than without it and suggested the changes in pressure throughout the night most likely wake me up. Since I'm a SUPER light sleeper, she might be right. Whenever the pressure is above something like 7, I leak like mad. I did try 6-20 and 7-20 this week and it was terrible.. worst nights of the last few months... like I said, even leaking through the tape and everything. My respiratory therapist suggested I try a fixed pressure of 7 with an EPR of two... but I've read everywhere that EPR should be disabled.. what do you guys think of that?
LSAT : If I set the maximum at 12, it will be at 12 most of the night and make me leak like crazy. I absolutely don't know why it's doing this in my case, I feel like the auto mode just doesn't work since I get better AHIs with lower fixed pressures than whenever I try the auto mode... I don't know if my machine is failing or my sleep is so messed up that it doesn't pick up on the right things with me... but even my respiratory therapist and pulmonologist are both puzzled.
Dog Slobber : The reason I say the therapy isn't working is because I know what my data was like on the initial test and my AHI wasn't all that high. In TOTAL I had an index of 16, but most of it was what they call hypopneas with autonomous micro-awakening (liberal translation from French here since all my results are in French... sorry if that's a wrong term). I had 10 of those per hour and only 2.5 obstructive apneas. My doctor says my treatment would make a difference in my life only if I get below 1 AHI, above that she considers it not working and she even suggested I sell my machine if I can't get it under 1, reinforcing the fact that my disorder isn't detrimental to my health in general considering what she saw in the results.
Miss Emerita : Okay, I'll do that whenever I post more graphs. Regarding whether I feel more rested the answer is a big loud and crystal clear NO! I actually feel more tired than I ever have and have the poorest quality of sleep I've ever had, which means quite horrible since I've never slept well in my entire life apart from a few golden weeks every year !

Also, I regard the leaks as unacceptable because I open my mouth and just spit air for minutes on end, getting my mouth totally dry and waking my girlfriend up in panic telling me to breathe, every night! Unfortunately my work schedule doesn't really allow me to have regular bed times every day, but I do my best... might have been a hectic week.
kteague : How do you practice that? I do actually fall asleep every night doing exactly that and also sleeping on my right side, but always find myself sleeping on my back with my mouth leaking. How the heck can you control that while sleeping?! I also try to sleep on my side and I do have a firm flat pillow! And yeah I've ruled out pretty much everything else regarding my non-refreshing sleep... I even stopped taking an anti-depressant I was taking for anxiety, fearing it might make me sleep worse. Quitting that hasn't really improved anything yet, but it wasn't helping at all while I was taking it, so no regrets here! I don't drink and never consume caffeine past the first 3 hours I'm up in the day, but as I said above, I've never slept well. My mom would tell you I had trouble sleeping as early as 2 years old.. and it never stopped. I had entire nights of insomnia from my teens onward.
Okay, I think I answered to everyone here?!
If this means anything, I'll just add a few details about myself : I'm 33 years old, 6'1 and about 215 pounds.. so a bit overweight but nowhere near obese. Let me know if any other information could help!