I run 2 8820s . Leave the beater speed alone, insulate under the metal plate under the set and fix all the cab uphostery it helps keep it clean and quieter  Aim and clean the original halogen lights and add some cheap LEDs that's what we did on one of our combines. I just use straw spreader on my machines as we use Shelbourne strippers in wheat and not really any straw even going in the combine also we have airfoil; chaffers and love them for wheat. also run the older slower sprocket on the cleaning shoe will help to not break it.  We also use a 843 corn head for our small amount of corn.