rcambray, since I own Kubota instead of Deere, and am not very familiar with your model, I guess I'm not the best one to try to answer, but doesn't your tractor have an adjustment knob to adjust the lowering speed of the 3-point? I think it does. If so, tighten it a bit to slow the lowering speed and I think you'll get rid of that jerking. At least that's the way it works on my Kubota.
Bird