The crimp is pretty light already at 0.422". I can try going a bit lighter but the case will be slightly belled. When I was using the Lee FCD, I tried crimping to 0.423" and, when I did, there was still a hint of a bell in the case.
Could there be a chance that what I need to do is tighten the crimp a bit to eliminate the moly residue? I have never crimped any tighter than 0.420" and then only with FMJ.
I had problems before with moly and it was all due to a half turn of crimp on a Lee FCD.