I WAS exactly where you are, I have found that using autocomp with 9mm is no diffrent than loading for my 40, no pressure problems, no issues at all. I have only shot my 9mm in 2 matches one last year and one this year but it dosent have the face slapping blast that some powders do, I am only running a 166 PF @ 7 grains so I would need to buffer for a big match. On my 40 i was shooting autocomp with 135 grain bullets and I liked that load a lot.
I am just getting used to the dot now, I was running iron sights on my 40 only because I didnt want to spend the time learning the dot, last weekend I only lost the dot once and it is on the stage I posted here.