Reply to Technic Turntable/Shure M44-7 Skipping

Hey guys.

Got two technic 1200 mk2 (used), new rane ttm56s, shure m447 carts. When I scratch I get the needles jumping at times. I always keep the anti skate at 0 but turn the little round thing underneath the tonearm to 2.5 or 3. I have tried 0 also. I've followed various tutorials online and youtube. Its hard to do intensive scratching because the needles skips just a little. I've calibrated the tonearm several times. Should I replace both Tonearms with a new one? Five months ago I got new rcas and cables replaced on both turntables. These needles are fairly new. I've cleaned them off also. Maybe the records I'm using are just fairly scratched up or warped? Any suggestions is appreciated.