Lower EPR Higher Hypopneas

My numbers are pretty good, including the odd <1 though this is infrequent. Over the last few months my major events have been CAs and as I had an EPR setting of 2, I wondered if I was getting some CO2 washout. So last week I dropped it to 1 and this didn't affect my sleep comfort. I got to sleep just as quickly and either had one bathroom stop or slept right through the night.

My CAs have gone right down but my Hs have gone right up. I also don't feel as if I got the sleep quality that I normally get. It's not a significant loss but I have noticed it.

So could a lower EPR cause this? Is this normal? Should I increase my lower pressure level (from 10 to 11) to compensate? Has anyone else noticed this effect?

Lowering EPR from 3 to 2 or 1 effectively increases the overall pressure a little so when going from a higher EPR to lower or to off you shouldn't need to compensate for anything by increasing the pressure.

If anything, at least in theory, one could maybe drop the pressure a little bit.
Since the EPR reduction is only upon exhale the overall drop might not make a big difference in therapy unless one is already right on the line where therapy is easily impacted negatively. Like already using the bare minimum pressure to hold the air way open and adding EPR into things drops down below that bare minimum during exhale only.