Help with some sleeping issues

Hi all
I've been lurking around here for a little while in an attemptto gain some insight into my own sleep and some of the issues I have been having. I was prescribed APAP 5-15 in April 2017 for an AHI of 15 when observed at the sleep study caused by OSA. While I have found the treatment helpful for afternoon fatigue, I still have issues with morning fatigue, dry mouth, and sometime feel like I need to lay down in the shower for a bit after waking up. To help with the dry mouth I've been taping my mouth over the past couple of days while also upping the minimum pressure trying to figure out the threshold that stops or continues to decrease the hypopneas. I'm currently set at a range of 10-20 and have been finding some success. There are however a few questions I have that I am having trouble answering myself.
1. Why do the below breathing patterns look choppy (first is 5-15 no tape, second is 10-20 mouth tape which I think looks more normal) and is this something I can/should try to improve?
2. My understanding after watching the LankyLefty videos are that the CA events are often mislabeled, while this seems to be the case in about half of the CAs, I do tend to have some that look legitimate (see above graph), I've seen that turning of EPR can help with this potentially and am not bothered by turning it off so I've gone ahead and done that. Is there anything else I should be paying attention to/looking to change?

3. I've attached two graphs below, one from before the mouth tape and pressure change and one after. I feel good staying at 10-20 with the mouth tape for a little while to see if I have consistent improvement but am curious if its worth continuing to raise the minimum or making any other changes? ~1 a week I don't feel fatigued and drained? (hard to find the word) when I wake up, my hope would be to feel that way more consistently as I am a 22 year old with some athletic goals that are noticeably affected by poor sleep. I'm not taking any medication or consuming alcohol and haven't been since my diagnosis.

Looks like the graphs got jumbled for the breathing patterns, I’ll update tonight once I have access to the files again. Sorry about that. The Jan 1 graph is with the the tape and raised pressure and the Dec one is without (for the time being)

Scrap the calendars - they just get in the way...

First of all ignore the few rare centrals that appear real and related to for sure asleep breathing.
It's normal to have a few of those...called sleep onset centrals because they can happen when going for awake to asleep.
Just ignore them...can't do anything about them anyway and I doubt your centrals are related to EPR...so use EPR if you wish or if your centrals were greatly increased in number when you used EPR and they were all primarily the real deal.
Secondly....even if all the centrals were indeed the real deal there's not enough of them to warrant concern or trying to do anything about them.

Now you do have way too much fragmented sleep as shown by the multiple breaks in therapy. I am betting there are more where you don't turn the machine off.
Figuring out the cause may not be so easy and then fixing the problem may be even more difficult depending on the cause.

Do you take any medications of any kind? If so, what. Medication side effects are the first well know culprit for messing with sleep quality.
And don't assume that just because a medication comes with a may cause drowsiness sticker that it won't mess with sleep quality.
I take a pain pill for arthritis that comes with a "caution may cause drowsiness sticker" but hidden deep in the side effects is also a listed insomnia as a side effect. I drew the short straw on that one. I might go to sleep easily but I can't stay asleep easily and when I wake up it's often so wide awake that I am up cleaning the bathroom at 2 AM.

As to what settings to use....the ones that make you feel at least marginally better in terms of sleep quality as well as how you feel during the day no matter what the numbers show on the reports.
What's your primary goal...a good math score or feeling good and sleeping good?
The best numbers in the world don't mean squat if we sleep like crap and feel like crap.