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You seem to have two problems.
First is crimping pistol and 9mm specifically.
9mm headspaces (or is supposed to) on the front of the case.
My take (and its just mine) is never seat and crimp in the same operation.
Always keep it separate. More so in pistol but I never crimp either one while seating (and yes I used to 40 years ago)
What you want, if you are going to crimp, is a mild (by feel) taper crimp not a roll crimp. As little crimp as you can get an a light press (RCBS Junior) is better than a RCBS Rockchucker.
The other part is you are operating in a very narrow range, even for 9mm.
Many low loads won't cycle the action, but you don't have much latitude.
HS-6 is a good 9mm powder, others as well.
Also keep in mind, seating too deep with 9mm increases an already dicey pressure situation, 9mm and below are tweezer loads and very tiny factors have big impact.
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