crop conditons: 200 bushel+, 19% moisture, current losses are @ 2 to 3 bushel meaning 20 to 30 seeds to sq. ft. right behind combine, with straw chopper front and a 6 row corn head. This is running 3 to 3.5 miles, cyclinder @ 400, concave @ 27. Had 9500 tranded 9550. My 9500 could run these conditions @ 4 mile and hr. all day long. Have under 5 kernels per sq. ft. with cyclinder 300 to 460 when kernels are blown apart, concave clearance from 40 to 9 all settings were tired and with cyclinder speed setup @ what the book says and still have major walker los. Dealer service man was out for 4 hours and doesn't know what to do. Rasp bars are fine, concave is level and set per spec. It is a Kuchar Concave which the 9500 was --so no difference there. Everything checks out -- shoe supply augers are taking material away and not jamming up under the concave and not restricting the concave. Concave is not plugged with any debris. It is not shoe loss or cornhead or holes under the combine--it istotally walker loss. Have been running walker machines for over 12 years and have no clue what to do anymore. Totally frustrated and grain losses are totally unacceptable. Any help would be greatly appreciated. We did find that it had a beater slow down kit on which we flip around to speed it up instead which helped maybe 25%--added 4 more straw walker risers with no improvement. Machine has 2200 separator hrs. on it. Concave is fine.