I run the x-blade setup on mine. Factory HL on the bottom and G3 Gator on top. Honest to the man above it mows incredible, stripes fantastic, pulverizes leaves, and the deck stays as clean if not cleaner than the 7iron PRO under my z930m with the standard high lifts.
Quicktrack is the Wright Stander clone, with the bullnose deck. I've had good success with gator g5s, havent bothered with the g6s. Curious, for the x-blade setup, are you using a drop blade on top? or modifying it in some way to keep the 2 blades from moving and hitting each other should you, for instance hit a rock under leaves etc...?