In beans that will be ok but if you are in high yielding wheat and putting all the straw through you may get some rotor loss if wheat get's tough depending on what you run for concaves up front.
Good to hear about the straight seperator bars, I just installed some on my 1660, haven't got to use them, but I was having the same problem last year, even with the vanes retarding the flow.
Chuck, yes you are correct in my case. I got the machine from south dakota, simple a wheat machine, running corn and soybeans now. It is a speciality rotor, and had the little rasp bars through the whole rotor, took six of them off and put in 3 straight bars. Then I took the six that I took off the back of the rotor and put them up front, because they weren't wore as bad.
I always put on 3 straight bars when i switch from small grain to corn_beans. I have a 2144. That gives me a total of 6 straight bars for corn_beans and keeps my rotor loss very low. I also have the vanes in the slowest position.