Hi there, seems to me that if threshed wheat is passing right along the rotor, then it must be being entrapped in the other material and not being allowed to pass through the cage. Maybe there is to much straw being harvested, and a higher header may help, or too much ground speed might cause the same problem, or perhaps the easy to thresh wheat is encouraging you to use a low rotor speed. I guess a greener straw may cause the same problem, and I mention this because of the much lower harvesting temperatures we are experiencing on the south east NSW areas of Australia. It seems I have a similar hyper setup on my N6. I only use the plates on the right hand side of the cage. This is just me theorizing the problem, hope it causes an idea to come to mind all the best for the festive season