Did the replacement parts solve the problem? Is your trigger weight heavier now?
I had a similar problem and found that the gun was just bouncing way too much. After shooting through the chronology, I found the issue... My ammo was making 153 PF, and thats a bit too much energy for my style of shooting.
I use a KR9 that was tuned and built up by Dissident Arms. Super fun gun to shoot. The most important upgrades that I can recommend, (that are standard on the Dissident Arms KR9 Elite) are the ALG trigger, the mag release, and the selector.