Normally with a router bit, you take a counterclockwise movements on the edge of the wood with a bit turning clockwise. Easel does not normally do this. I could possible suspect this puts a lot of stresses on the mechanicals of the system and DOES at times allow chattering.
Also, please correct coding for traveling between carved areas and only raising the bit 1/8" of an inch. Many of my projects utilize a carved pocket of 1/4" with lettering in the pocket of 1/8" or more and the bit drags over my lettering destroying my carve. I have changed the safety height to 1/2" and that works but some other portions it will only lift 1/8" inch and drag over in a slow transition.