I have a T200, which is your machine with different decals. My machine also bucks when moving, especially with higher RPMs.
I think a lot of it is operator technique. I find that if I back down a few hundred RPM, and move the sticks very carefully, the jerking is less. I've read that wear in the Bobtach can cause bucking, and that could be a possibility. I know that my wedges are worn, and I presume the thinking is that the bucket or attachment can "catch" and release rapidly and cause bucking.