Name is John, live in suburban Philly area. Started with Airsense 10 Autoset in June, 2017, machine is still going strong at just over 17,000 hours. I have had an AirMini since they came out, as well, as I used to travel a lot, pre-COVID. I have not used software other than the Resmed myAir app, until now, when I downloaded OSCAR and got an SD card to play around with it. On the myAir app (I know, not highly regarded), my scores are consistently 96-100 every night, and if I get a lower score it's typically because I did not use it long enough. I'm learning a lot here, very helpful place, thanks to those of you who maintain it!
I don't need much in the way of help, per se, but I do have a few questions, if I may. They are:
1. Just ordered another Resmed Airsense 10 because they are becoming scarce, and I just love this reliable workhorse of a machine, and saw no reason to "upgrade" to the newer model with smaller blower motor. I've heard of people routinely getting over 20,000 hours out of an AS10 and my question is should I use my current machine until it dies, then go to the new machine (after testing it for a week for function)? Figured I'd get the longest run with this wonderful machine that way. Or is there a charity site that accepts used CPAPs to refurbish them for others? Maybe mine is too old.
2. My original prescription after the titration test night was 10-14 pressure. My weight has not changed, but my AHI has gone way down as I learned to use the machine and get consistent mask seal all night. But I'm consistently bumping up against the 14 pressure upper limit. The machine "auto sets". Should I raise my upper limit and see what it does? I've never fiddled with it in 6 years. My OSCAR screenshot is here:

3. Has anyone used the sleep consulting services at AXG sleep diagnostics? I'm considering it just to learn more about OSCAR and what to look for in terms of optimizing my sleep, although I have no complaints. Thoughts on this? May not be necessary. The guy puts out very informative content on YouTube, though.
Thank you again for this great resource! Again, I have no issues or complaints, just looking to up my knowledge level.
Cheers,
John