I'm just starting to get my KP97D broken in. I'm up to 450 rounds and it functions great. Wednesday night I shot a 100 rounds of my reloads through it and I noticed toward the end that the trigger was getting harder to pull. I also noticed that the last little bit before the gun fired that the hammer was actually moving back a noticeable amount. Most of my P-Series triggers have become a little smoother as I shoot and dry-fire them more, but this one is getting progressively worse. Any ideas what might be causing this?