i have a 2188, spec rotor, large wire concave.in trashy corn i have rotor loss. retarding vanes over grates helps some.my question is-would i get better separation by replacing some or all of the 8 straight sweep bars in the rear with spiked rasp barsIJ and if i pull concave wires will i notice more pods in the tank in tough beansIJif so that would be out.