We have this setup and the crew is fighting an issue of a consistent vibration at contract speed. If they put a few hundred pounds in car it goes away. This vibration is there in openloop or closed also its there if you just drift the car up by picking brake. There vibration isn't there during decel or acceleration. I'll be on-site tomorrow morning to help out diagnosing. We are leaning toward possible machine issue. This Is brand new mod. I'll go through the basics, encoder, parameter setup ect. What say you??