What's the diameter of the bullets? Is there large variance from bullet to bullet?
I would guess that you are afraid of working the brass too much and that is causing you to not expand enough and not crimp enough. If properly expanded you should not be shaving lead unless some of the bullets are oversized. If properly crimped the bullets should not move after crimped. Heck, the bullets shouldn't be able to move after being seated unless the bullets are undersized.
I have .357 brass that has been loaded 20+ times and it still functions like normal.
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