I don't know your mask.. but the very first thing you need to work on is your leak.
You leak line is pretty bad. Go find your mask literature and look for the pressure graph and see how much the vent rate/intentional leak rate is for your pressure of 13.
Vent rate varies by pressure (goes up with increase in pressure) and with mask so you have to figure out vent rate for your mask at your pressure.
I can tell you right now it is no where near what you are seeing on that top leak line.
Top leak line is total leak...which is mask vent rate plus any excess leak.
You are in or nearly in large leak territory for the bulk of the night. It is bad enough to impact therapy. It is bad enough to allow a few events to slip past the defenses.
You can't really expect to clearly evaluate your AHI until your leak is controlled better.
A few minutes of large leak isn't that big of a deal but you are spending the majority of the time in or near large leak.
As a side note..the clusters of events you see right when you first start therapy or after the break in therapy probably aren't real...most likely awake or semi awake events so they are elevating your AHI a bit.
Edit to add this leak example..my mask at my pressure will have a variable vent rate because I used APAP with variable pressures. My vent rate is around 25 L/min...compare your leak rate to mine...see the difference..you need to be below 50 L/min for the bulk of the night. Large leak territory for the new PR S1 machines seems to be around 75 L/min or maybe 90 L/min at the outside..you spend way too much time up in large leak territory.
Are you waking up often due to leaks? If so...you likely have more awake/semi awake events being flagged (the machine doesn't know if you are awake or not).....
Main thing.....fix the leaks...whatever is causing them.
Which mask are you using? If you are using a nasal interface mask and leaving the mouth uncovered then it may be mouth breathing we are seeing here. Whatever it is...it needs serious work before you start even thinking about changing anything else.