Thanks Farmerjones, it is a 2013 model.
Bunching in the taper if the feed drum was in wheat, barley and oats but not in canola.
It would bunch for so long until the feed drum clutch would go off and then generally underfed when the bunch got far enough out to get caught by the side draper belt to carry it back under.
If it is bunching and wrapping around the feeder drum taper there is a kit for that. If it is bunching and wrapping under the side draper belts you might want to play with the side draper belt frame and slide it out. Both sides will slide out or in depending on your conditions. Pretty straight forward to slide the frames. We run ours with about 1 1/2 inches overlap of the center frame. Hope this makes sense if not PM me and I will go into more detail of it.