If its a stock machine put some wedge in the concave and that should get rid of the small cobs thus the whole cobs won't get in your chaffer I talked to a guy yesterday that has full amount of wedge in his concave. If it is hypernized you better get some help from the smart guys on here.And I don't remember getting to many awards for that in my day . Hope it helps
try this. Set cyl speed at 325 - clearance at exactly the same diameter as the average size cob. Make sure the grate is level. MAke sure the mid setting is 7_16ths inch clearance then move it down two marks towards "max". Remove the wear strip on the door. You don't have to run the screen wide open - try 9-16th or 1_2 air on 5.5 to 6. Close the seive down as tight as you dare. The only thing that will happen is you might plug your tailings and if so open the bottom seive just a tad. If everything else is up to snuff you should be ok and getting better as the moisture goes south.
I agree with tbran. Speed up rotor to 325. Fan to 5.5-6. Close down sieve until you get a clean sample. If you go to far, it will return too much. Are you on 30" rows or 36"IJ If on 30's, speed up, the combine is running half empty. It is hard to clean unless the combine is running close to full.
The White Cob variety of corn will break up more, no matter what you do. And use the Pacer and get the rotor full. The smallest head suggested for the 6_60_62 series is a 6 row, drive faster!
Try you concave on 9, 3_4 chaffer, 3_8 sieve, cyl speed 350,full wind sounds like you are holding in cyl too long, should be getting mostly whole cobs out of the discharge. Is your feeder chain speed on low speed pulleyIJ
I agree with the above guys - cut the beast loose and let her fly! We run 4 mph or better with our R52 - same size head and many times better corn. Your shoe is HUGE compared to the 52's shoe. There is a guy not far from here that runs a 62 with a 6-30 head and he can never get his Pacer out of the green no matter how fast he goes. Only limit is the corn head and his nerves. Good luck and enjoy the 62- Tom langan
Speed up your rotor to 350+_- and get your ground speed up to 5 or get an 8 row head. Even at 28% moisture with yields in the range you described you should be able to run 5mph plus.