I feel that way too! It's great that you have such positive feelings so early on. Good to read that you figured out the Quattro!It's weird but last night I was actually looking forward to masking up & the pressure. It meant I would be able to sleeeeep and after awhile the inhale/exhale of the BiPAP becomes oddly comforting, a relaxing rhythm almost.
I've never used a PR System One machine, but my understanding is that the AHI reported on the machine's LCD is the average over 7 (less if the machine is new) and 30 days. If you were indeed looking at AHI and it said 22.6, that does seem very odd, especially given that your sleep study AHI was less than that.
If your leak rate (System Leak) is too high, then your AHI may be incorrectly reported. It's difficult to tell about leaks with your machine, as the System Leak only reports percentage of time spent with large leaks, as 7- and 30-day averages. It could be that the first night's leaks were so large that it adversely affected reporting. Do you recall what the System Leak was? When you get the software, you should be able to get a MUCH better sense of what's actually happening on a nightly basis.
The are a lot of different opinions about cleaning, how often to change the water in the humidifier, etc. You can try searching the forum for information about that, as there have been quite a few threads regarding those subjects, or perhaps others will share their practices here. I was very diligent about cleaning hose and humidifier weekly for a while, but I became quite lax as time went on. I add water to the humidifier daily and change it out about once a week. I haven't washed a hose in months. I do wash my mask/nasal pillows daily in original Palmolive (green). I think just using the wipes is fine. I don't wash the rest of my mask, but I would if I had a cold or something. It'd be a good idea to check the vents to make sure they're clear. I've never had any problems at all following these practices. I distill my own water, and my humidifier chamber always looks clean. As for filters, that depends on your room air and filter type I guess. I used my ResMed S8 machine for 7 months. I checked the air filter every month or so and never needed to change it.
It sounds like you're doing well. May you have even better nights ahead! And may your daughter sleep through the night! I hope you're able to get a little extra sleep this weekend if you need it.