I didn't throughly read all the replys to you question, but I didn't see any suggestions to re-set the dies. I had similar symptoms and did the whole die cleaning/de-burring process. (Brillo pad wrapped around a small caliber bronze brush on a cordless drill). Slight improvment but didn't solve the problem. I finally reset the dies and made sure they were true to the stroke of the ram (Dillon press). No more Scatches.
Dad !!! "It's only going to be perfect if you do it yourself." - my teenage daughter
Dad !!! "I'm not scared" My Cancer fighting daughter."
NRA - Life Member