Zero Turn Mowers

This spring I purchased an MZT61 and I've had some issues with the mower deck. So far I've had two spindles go bad and recently it started mowing bad, the center blade was cutting closer than the rest. I replaced that spindle (one of the two) but it didn't fix the problem. I decided to raise the mower deck and do some measuring and found that the center spindle mounting area of the mower deck was bent enough to make the blade cut closer. measuring from the blade to the mower deck from end to end it was about 3/8" difference. I'm starting to regret my purchase, I had no issues with my last Husqvarna 42" zero turn with a stamped deck. I went to a heavy duty mower and now I start having issues. That just doesn't make sense. I use this on my own property mowing about 4 acres of grass, the worst thing I've hit was sticks in the grass or dirt around a mole hole. Nothing that should be effecting the mower deck nor the spindles.