I purchased a Z920 this spring with a 54" deck and a 26 HP Kawasaki and have struggled with the deck filling with clippings and dropping them when I shut the mower down or stop momentarily. I have a mulch kit on and after two sets of JD blades went to the Gator blades. They are a bit better but I'm not happy. I've put 140 hours on so far this year and am getting frustrated. My blade tips are wearing badly which eventually leave trails of clippings. I"m sure this is due to the excess grass accumulating in the deck. Does anyone have the same issue or a fix?