We haven't moved any augers forward but have had no trouble at all with material coming up around the back with the 700 or 800. Down and back from hyper mod site was the rule of thumb for the 500, 400, 300 and prior headers. I haven't had to champher front edge of hold downs but wouldn't hesitate if I couldn't get her to feed. Sometimes the littlest snag can hold up the straw. Good luck