Thanks for the suggestions, guys (this is the non-gender-specific "guys" by the way!)
In the vast majority of the cases I know more than tech support
and I tend to turn to the experts on forums.
But in this case, ya'll were absolutely correct-I called Dillon and they gave me three options. One was the correct one, and I never would've found it on my own.
Turns out the indexing activater that causes the shell plate to rotate as the ram comes back down can be adjusted to correct the timing. Mine was activating too late, which meant the shell plate wasn't rotating quite far enough to align the primer pocket with the new primer cup.
300 rounds later, not a single flipped primer, even in some military crimp brass that snuck in.
I'm cautiously calling this problem solved.
Thanks again for your help.
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