Been a long time since I ran a cts, but as i remember we never really had many problems with damage to grain from the rotors. Chickpeas and beans are another story and you may want a slow down kit if your going to have a go at them. Just be careful as to how wide you have the drum open in swathed crops, ie always handy to have a bit left to open up if you cop a slug, although if dry it shouldn't be as big an issue. I'd keep it open at least 3_4 open or bit more and have the drum running at 700 or so. Then start fiddling from there, remember to try speeding up of slowing down the drum before closing up the drum. Unless you really need to give it a flogging in the drum, because it has gotten tough, let the rotors do the work and do all you can to keep the mog off the sieves.