Adding a little to what's been said...
As you increase the flare, try seating the bullets by hand, off the press.

For some bullets, the case should be expanded enough for the bullet to firmly stay in the case and not force it on the press.

The whole bullet depth is being seated.....so, it's expanding a pretty good length of the case.

I hope you get it to work.

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I'd like to agree with you BUT