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Just a wild guess...
but I'd think that you having to crimp too hard which is bulging the cases during the crimp and they're being Un-bulged (a new word???) on the way out.
I'd check case length. I'm wondering if you have to crimp too hard because the cases are too long and the extra hard crimp makes the mouth smaller and effectively shortens the case.
I use Dillon dies for my G20 and they feed fine with light crimp, but then I have the sloppy Glock barrel.
The other idea I had was maybe the inner body of the FCD was cut too big and lets the case expand too much.
Thinking back, I use FCD for my 45 acp and 44-40 and it drags pretty good sometimes. You can sure tell when it's straightening out the cases.
Dunno..random thoughts
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