The Lee Factory Crimp die will probably help your situation; but I really think a better solution would be to reduce the diameter of the expander a couple of thousandths of an inch. Don't be too aggressive, think of the operation as more of a "polishing" than "sanding it down".
0.002" is about the thickness of a human hair.
To set-up your seating die, put an empty; but fully resized case in your press and install the seating die. (Make sure the seating stem is well up from the final position.)
put your ram to the top and screw your seating die in until you just feel it contact the case (all your cases are trimmed to a uniform length, right?)
What you're feeling is the crimp shoulder just touching the top of your case.
Lock the seating die right there. (for now)
Seat a bullet so that the top of the crimp groove/cannelure is just visible over the mouth of the case.
Drop the ram, unscrew the seating stem 3-or-4 turns, unlock the die and screw it in about 1/4 turn, and raise the ram, slowly. You should feel the die touch the case just as the ram gets to the top of its travel. Lower the ram and have a look at the crimp. If you'd like a bit more crimp, screw the die in about 1/8th of a turn, send the ram up and then have a look at the round... Good crimp? Any "wrinkles" or "bulges" anywhere on the case indicate too much crimp.
When you are happy with the look of the round, put it back in the press, raise the ram and then lock the die in position. (putting a round into the die takes all the "play" out of the system and locates the die more exactly)
Then with the ram still at the top, screw the seating stem down until it's firmly in contact with the bullet, and lock it there.
Now make-up a round with that die setting and have a very close look at it, if you are unhappy, adjust the seating die (very small adjustments should be all you need).
Once you are happy, make double-sure everything is locked down, and you're good-to-go!
