After updating Mach 4 and the Hicon 7866 plug in the the machine has had a stutter/jerky motion. I cloned the profile and reduced the accell and decell numbers by 50, it's better but it still isn't as smooth as it was. Any suggestions? 
4axis router 72"X120", DMM servo motors,  Hicon plug in V2:50-84, Mach4 version 4.2.0.5036

should have read 50% not 50, motion mode constant velocity, distance mode absolute