Can you get the head of your bed up a bit? That, and try to avoid sleeping on your back for now. There are a number of goofy ideas to help you do that, such as wear a backpack, or sew a tennis ball in the seam of a t-shirt... That sort of thing. But mostly it's whatever works. Maybe even just a pillow strategically placed.
I think that would drive your events down considerably.
Then, once things are calmed down, you could increase the pressure a little bit at a time. Not more than .5 at once. Then run with it for a few days to see what happens. The goal would be to get to that sweet spot where your OA's and Hypop's are lowered considerably without increasing your CA's. Clear Airway has a way of going up whenever you make a change, which is why you only want to make small adjustments, and only one adjustment, at a time.