UARS diagnosis? No improvements on CPAP. What Bilevel machine to get and where?

[-RP11-]

Hello all, thanks for your help - its massively appreciated.

I'm a tall very thin male with small facial structure.
Had 1.5-2 hours wake time on my whoop data so decided to get a Watchpat study.
Results (attached):
pRDI: Total events 88. 14.6/hr in REM, 12/hour nREM. Average all night 12.3/hour. (18.7 when supine)
AHI: Total events 46. 8.3/hr in REM, 6.2/hour nREM. Average AHI 6.4 (11.4 when supine)


I have tried a MAD up to 10mm with no success (persistent high awake time on whoop and subjectively unrefreshing sleep.
I have also tried a Hypnus CA820W CPAP machine up to 9cmH20 with no success also.

3 questions:
1. Can OSCAR software be used with Hypnus device? Any other treatment therapies for UARS you would recommend trying?
2. What Bilevel machine would you recommend for UARS?
3. Where should I get this machine (off-prescription as the waiting list is long before I see sleep specialist again)?

Thank you.