We have run Kirby's on '88's for years, have the separate hydraulic system, and to stop stuff from being thrown over the backhave a deflector plate directly above the Kirby directing everything down directly into the cone. It thows 40' plus in dry wheat. We have just traded up to and are running a 40' front, but are giving the standard spinners a go this time, but if they don't spread any better the kircby is goin straight back on.