When I demoed one in canola the salesman had me close the bottom seive a little more then the automatic settings took it to. my only beef with the wts was it was a typical walker, Capacity was limited by the walkers. I think some operators of walker machines play with the seives and fan way to much. Just get your sample clean and the return nill and then watch you walker loss. The shoe is not the limiting factor on wide body conv. John Deeres.
I know of 3 in the area and I have sold a 20% power chip to all 3. They would never run without it.
One of the 3 had trouble with the rasp bar bolts falling out. Then I found out about another one about 100 miles from here with the same problem. They both got high inertia cylinders paid for by warranty. I recommend the cylinder upgrade anyway.