If you want to get rid of the white caps the hard to thresh kit that is available from case ih is your best option,expensive but it works.We have also retarded the vanes in the theshing area,and in mid position in seperation area.It uses a little more power but it helps.This is what we use for settings,1st and 2nd concaves are small wire,3rd is large and 4th is large skip wire,rotor 1050 rpm,fan1000,concave at 0 to 5 (depends on cracking) top sieve 15 and bottom 13 if calibrated properly.Set your tailings to 100% and make sure your tailings are minimal so you don't overload the sieve, pre sieve opened to the 2nd to 3rd notch.These are the settings with vanes retarded,hard to thresh kit is different.