problems reloading for the M1 carbine

Well, I am loading 115 grn. lead bullets with 14 grn. of H110. Everything is trimmed right and seating depth is .020 under C.O.L. Win small rifle primer, L.C. once fired brass.
I am using RCBS three die set and is a roll crimp die rather than the preferred taper die. My problem is light primer strikes nine out of ten times. I jsut can't figure out wha tis the problem. I have two carbines and it is doing this in both. So I think I can eliminate the gun factor.

Could this be a head space problem due to too much crimp?