I slowed down the velocity in Mach3 to 60ipm and in VCarve I adjusted the step-over to .05 from 1.0
The chatter is better but not perfect, and I can still see tool markings between the .1" depth of the passes. Either way I should be able to cut a .1" depth with a 1/4" bit at around 100ipm and still get good results.
These adjustments helped a bit, but did not solve the problem.
The Router looks good and all the bolts are tight, so not sure that's the problem.
What other adjustments should I look into?