Currently on our third year of running a lexion 450. Have been running the large spacing concave (edges are still square, rub bars are almost new) since that's what came with it and have been doing ryegrass, clover, oats and beans with it. Ran wheat with it last weekend and that was a tough one. Had concave all the way closed, sped up to 1000, fan speed cranked and chaffer closed to 1mm, and still didn't have the sample as clean as I wanted it. Long story short, looking now at different concave options as this can not work long term, especially as we increase acres. Currently looking at the multi-crop concave from sunnybrook. Would be looking at doing oats, wheat, fall rye, annual ryegrass clover and maybe canola and other grass seeds with it, and would keep the concaves I have now for beans and any other large kernel crops we do in the future. Is it a worthwhile upgrade or should I just try and find the right concaves from lexion? Am I even on the right track going this direction or is that the wrong concave for my goals? Would rasp bars be a worthwhile upgrade while I'm in there also?