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Are you using a dedicated seating only die or a normal taper crimp seating die backed out to not crimp?
I'm sitting here looking at my RCBS seating die, I can see the taper crimp part of it up in there and the area above it is sized to hold the bullet straight, if that die were backed out a little to far I think the base of a round nosed bullet could be down in the area below the taper crimp and flop around little and make it seat crooked. Round nosed 9mms have such a small area that is full diameter.
Above the taper crimp shoulder is a reduced dia and holds the bullet straight. Try using that die as if you were going to taper crimp but back it up just far enough that the taper crimp just straightens out what ever flare you have and see if the bullet is seated straighter.
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