Did you install the green stem kit while at itIJ Thats the kit that adds another row of helicals on thresher side and hooks up the steeper pitch thresher helicals to shallower pitch seperator helicals. I doubt very much that your setup will cause any more short straw than previous factory setup. You should be able to tweak down sieve to get rid of short straw if chaffer didn't do the trick. Stacked helicals will be most benifitial in the tough going and not as much in good going. You might want to consider switching out at least one of them reverse bars for forward. Good luck