Well, if I was going to slow down and overlap my path that would kinda defeat the purpose of having a zero turn that can mow faster. I could just as well go back to mowing with my Deere x758 which doesn't require overlaps or multiple passes and uses less fuel (it's a diesel) and finish in the same time then. I bought a commercial quality zero turn so that I could reduce the time to mow my 7 acres.
The blade sharpness is something I'll check. I assumed a new unit would have sharp blades on it, but that could well be false. However, the fact that the 'mohawks' are due to grass that hasn't popped back up to normal height, not a generally uneven cut, makes me think even sharp blades aren't going to resolve the issue.
That said, BB has been good to work with on this issue and the unit is currently back at the dealer having some revised front wheel arms mounted. This redesign (which may become their new standard for future models) moves the front casters out of line with the blade spindles. Apparently the thinking is that the part of the grass with the least blade coverage (by percentage) is directly in front of and behind the spindle (think about the area of a circle being cut by the blade as the mower moves ahead) and combining the lesser area with the knock-down from the wheels is a bad combo. I'm not entirely convinced but since it is free to me I'm willing to give it a shot. At this point I'm so unhappy with the cut I'm ready to sell the unit so any improvement will be appreciated.
I will try the high lift blades mentioned above when I can, too, but they were out of stock when I tried to order last week.
Rob