I have had a 9850 since 2000 and I hate that SOB. The large auger is the biggest problem with that head because it leads to so many other problems like yours....feeding. The big auger was put in to quote "handle high yielding crops better" Bull n$%@. I had an old piece of junk 1859 before the 9850 in 60bu beans in 1999 and it "handled" the crop just fine. The large auger has increased the size of that dead spot just over the cutterbar, leading to the bunching problem. So what does Agco do, gives you the useless feathering sheets to put on. What a disaster those are. If you plug the head or feederhouse with one of those bunches, (yes it will still bunch under certain circumstances even with the sheets)and you reverse the feederhouse, the clump of crop catches the feather sheet and flips that up in the air allowing trash_crop to get under the sheet, not allowing it to go back down all the way, and you feeder fingers start playing it like a tin drum set. Now your out cleaning_sorting out that mess. I combine in north central WI where our beans don't get really tall on average like many places. When I asked for the reason for the big auger and they told me why, I asked "So you built a head that only feeds the perfect cropIJ" I got no reply. So, what to do nowIJ Well, "just put on an air reel" they tell me. GREAT, I'll just go and spend another $7000 to make your brand new head feed the "poor quality crop" that I have to combine. Well, I was young and dumb, and I did put on the air reel. What a gift from heaven that is. It feeds the crop in evenly and I took off the feather sheets to get that extra crap off the platform. My neighbor got a brand new 900 series deere head without air reel when I got my 9850, and I help him take his beans off so we ran side by side. That head fed three times as good as mine.(before air reel) This year they traded their 900 for the 600 hydraflex and that one feeds good too without air reel. Also, other neighbor has 1020 IH head without air and it feeds three times as good as mine did. Wow, that felt good. Everyone should vent once in a while. Good for the heart. Anyway, I will be reasonable and say that there are redeeming qualities to the head as stated earlier. The flex action is great and the large feeder fingers are nice. Add the air reel(which I would do to any flex head as it does reduce header loss) and its not bad. I think I would rather have a Young's modified 1020 w_air reel on my XP in a perfect world. Good luck, Jesse