I'm running a '01 Zd21 with the stamped deck. I bought the new gear to speed up my blade tip last year, i use high lift blades, the underside of the deck stays clean, but on the exit side of the deck (Chute side) some grass is still standing after cutting. It's not like there is a strip left there (ex. gap between right and middle blade) it'sjust not cutting some of the grass. I also checked to make sure the blades are tight too......and sharp obviously. Is it possible that the high lift blades are creating so much vaccum that the air hits the bottom of the deck and the air goes back to the grass and pushes the grass back down so that it doesnt get cut? Any suggestions on what to do to fix this.