I have sleep apnea (RDI some place in the high teens) and have been using a CPAP since 2010. While I have been cycling for almost 20 years, I don’t have pre-CPAP data for comparison. However, I can tell you anecdotally, that there is a HUGE difference of getting high quality sleep vs. not, even on substantially fewer hours. And beyond performance, there are major health reasons (i.e. getting oxygen to your brain) for getting your sleep apnea issue addressed. You did not mention your age, but regardless of age, with an AHI of 30, even with 9-10 hours, that isn’t a restful sleep. And thus, you have a good reason to be elated about the findings.
The CPAP I am using is the Philips Respironics. I previously used the ResMed (the other popular brand), but I like the Philips for the online app it provides (and a few other features). Below is a sample screenshot of AHI over a 60 day period. The “DreamMapper app” also provides screens for usage (#hours of sleep) and mask fit (%). As you can see from the screenshot, you can get single day, 14, 30, 60, and 90 day views. And if you are deeply analytical, since CPAPs require a prescription, the CPAP provider for Philips can provide you with a full detailed report showing each apnea and hypopnea event (I got that report when I first started using it, but don’t bother anymore). Bottom line, getting your sleep apnea issue addressed is a game changer, not just for performance, but your health.
Feel free to PM me if you want to discuss further.