1688 speciaty rotor has a problem overloading chaffer,sieve and return when dessicated wheat straw breaks up too much. Slowing rotor speed and or opening concave leaves too many unthreshed heads. This occurs only on real dry conditions. Chaffer has three adjustable sections. We usely keep the front almost closed and the others near half inch. Sieve about quarter inch. My question is, will the air deflecter kit help solve this problem? Forgot to mention wind setting at 1150-1200. Thanks for any experieced help.