DD,
You got a lot of suggestions there but until you try the simplest (turn your current FL die down some more, such that some force is required to cam over the lever on your press after the die contacts the shellholder) I wouldn't worry over the other stuff.
Probably a good idea to make sure the shellholder and die are of the same brand, if the above doesn't work.
Let us know what your solution turns out to be, if you find one. Good luck with it.
Rex
P.S. of course if the "turn down the die" plan works, then you'll want to back it off until your bolt will just barely close with a little resistance, and that oughta be perfect. But it sounds like you know all that stuff.
