Dude,
The rims on my AWS x495 and on my AWS x300 both were different offsets than most other Deere rims -- in part to contain the steerable hub but also to contain the 'sweep' of the tire tread in full lock to lock angle changes relative to the deck, frame, fenders, etc. In addition to the stock tire sizes, do you have the correct rim offsets?
My x495 had a 62 inch deck, and everything cleared as it should...but I don't think the rims can be reversed to "wide" and still work as they should. Here are some side, oblique and rear views to show how shallow the dish is on these rims in the AWS application.
Those are 26x1200-12 tires which are a stock size for this rig, and the stance is acceptably wide even thought the wheel offset is in the 'narrow' position as we think of it for other garden tractors...
Chuck