It is usually packed tighter at the ends, but I'm not sure that it isn't the auger jamming more in before I can shut it off. My beater was down pretty far. With fingers at max extension, they were just off the bottom. I raised the beater up near max this afternoon & set the fingers for early retraction (fully clockwise). I ground the flighting a couple years ago & it's still good. What are the retarder extensions? Never heard of them. When the auger fingers are pointing straight back, they are fully retracted.In normal height beans I can run 4 mph ok. I have some that got hit with dicamba drift that are really stunted, about 1 foot tall. These are what are giving me fits. Maybe raising the beater will do it. Rain tomorrow so I'll have to wait to try it. If not ,I'll try taking off the outside fingers.