Hello! Im new here so here goes.. Ive been roasting on a Diedrich IR-5 for several years and got the itch to experiment with different drum speeds. I just installed a vfd and 3 phase motor. When i speed the drum up much over the factory setting of 44 rpm it sounds like the beans are hitting something by the intake/loading funnel area. Its really annoying because the coffee tastes noticeably better with faster rpm but i dont like all the racket., has anyone else experimented with drum speed adjustment on a small Diedrich?