Thanks for all the great responses:
@AndE–I have not tried combinations yet. I have put stuff under the pad (rain gear), but it didn't help at least in combination with the specific pillow I was using. Some put their shoes under the pad, but I don't see how that could be comfortable. Maybe worth revisiting.
@Derek–I've tried the medium exped, perhaps the large would be better for me.
@Mark–I use smaller 1L bottles. I guess I could try several of them, but it sounds finicky.
@Mike–Thought about the snoring bear pillow, but have yet to try it. Does anyone have experience with this one?
@Larry–good point. I'm interested in the height of the pillow with my head on it. The Thermarest Compressible pillow retains much of its height even with my head on it.
@Jennifer–not sure I'm ready to shell out so much cash, but if nothing else works….
@K C–I saw this thread. If I were only so handy :)
@Kevin–the Q-core is 3" tall, probably not enough for a side sleeper. Glad it works for you though :)
@J R–I typically sleep with most of my clothes on including my down jacket.