Which wear strips do you have on your feed acceleratorIJ -- the segmented strips used for edible beans might help some. We see this on IH at times, also. Too much wear on front elements require rotor speed which is too fast and the rotor won't pick up material off the chain correctly, forcing some of it to the left side. Same probably applies here -- trash is probably piling up, maybe not being pulled off the throat chain because it's piling up and the accelerator can't force it thru, or it's feeding back over the top side of the accelerator. Either one will cause the l_H chain to tighten as material gets entangled in the sprocket and throws the right side out of time. Hope this makes sense.