two minutes into Pugsy's pointers, I have the wrong machine

I was tested a few months ago HST

AHi less than 5
RDI 17

I purchased the S9 auto.

It seems the s9 does not detect RERA while the PR-1 will.

Do I need to buy the PR-1 to understand what is happening in my data regarding my RDI or can the information be interpreted from the s9?

Those RERAs aren't always what they are cracked up to be. Sometimes interesting to consider as a possible factor when we don't sleep so great but not a critical factor IMHO that is a deal breaker if we don't have that data point. The absence of RERAs doesn't always mean no problems and unless the RERAs are present in truckloads...a few of them doesn't mean there is a problem.
The S9 AutoSet is a great machine and just because it doesn't flag the same data points that the PR S1 machine does isn't that big of a deal.

How are you feeling? How are you sleeping?

While it's really too soon to expect marked changes like some people are lucky to get, perhaps you are one of the lucky ones. The S9 AutoSet response time to flow limitations and snores is probably a little faster than with the PR S1 so there are advantages to having it also. There are minor pros and cons with either machine. To be honest I don't know just how definitive in terms of RDI having the RERA available actually is in terms of therapy. I won't go so far as to call it "all hype" as there is probably a place for that data point in the grand scheme of things but not having it available isn't the end of the world either.

I was feeling great and not waking up for any significant time during the night but, lately insomnia has returned along with a slight morning headache. I am awake at least 30-60 minutes each evening about 3 hours into sleep. Sometimes more than once an evening. I am getting 6-7 hour of therapy a night

I am still feeling a lot better than I used to as I was only sleeping 4-5 hours a night prior to CPAP

My AHI is now over 5 (most nights) prior to CPAP it was less than 4

My BP was high and was the reason for taking the sleep test. I was on 50 mg of labatoal and my pressure has improved. I am down to a little more than a half of a half of labetol probably 30 mgs. Blood Pressure is now in the normal to pre hyper range 75-83 / 115-125

I have lost 30lbs but still have another 30 to go

Your AHI.....what is the breakdown into even categories? Each index..central, OA and hyponea?
Are you spending much time at all on the machine while awake?
When you look at your software reports are there clusters of events? If so, where in relation to sleep time or wake up time? The machine doesn't know if you are asleep or not and it can and will flag awake breathing irregularities which can sometimes elevate the AHI and we have to discount any awake time when evaluating the AHI.

Not all insomnia issues are related to Sleep disordered breathing issues like OSA. It would be nice if they were because then the cpap machine could fix them. I am going through something like that right now myself. I used to be able to easily sleep 7 1/2 to 8 hours and I pretty much need that to feel my best but here lately last month or so I am doing good to get 6 hours and I know it's not my OSA therapy. I go to sleep just fine but wake up way to early to suit me and no chance of going back to sleep.

There's some question as to how well a CPAP machine can really detect RERA and UARS, but they do give you some info. Even in a full sleep test, it may be somewhat questionable without a pressure sensor in your throat.

The flow limitation info on the S9 might tell you something, as well as the shape of the waveforms.

RERA and UARS are still not as well understood or treated vs. apnea and hypopneas.