If I'm understanding what you're saying, you're getting a zig-zag effect in a sinlge 62 inch wide swath, with 3 high ridges where one side of each blade passes and 3 low areas where the other side passes. If I don't understand what you're saying, you're getting a single wide swath that is lower on one side than on the other.
In the first situation, the blades are not rotating parallel to the deck. They are all apparently angled in the area where the spindles are mounted to the top of the deck. Shims between the blade and spindle would make the blade hang unevenly, but it would cut level since blade speed is so fast compared to ground speed. You could check for this by measuring the height of each blade at various points in it's path. Set them straight left-right and see if they're all level. If not, your problem is in the deck, not the mount.
In the second situation, the entire deck is not parallel to the ground while moving and the problem lies either with your tires or the way the deck is mounted to the tractor. Tires are easy, check the pressure and make sure it's even all around and within specs. (If you have a passenger on one side, that would do it, too, but I presume you are being safe and have no one else on the tractor with you.)
For the deck mounts, make sure everything is connected properly and bearing weight when you are leveling the deck. The thing could be hanging there level in a stationary situation with one bracket not doing anything. Then when you start moving, the bad connection point allows movement of the deck. It might be a bogey wheel (if you have them) that's free to move up and down in it's mount, or a hanger that's loose on one end or the other.
My old Cadet has an annoying tendency to lose a hairpin, then the link comes loose and one side of the deck drops, but only when moving across the uneven ground. Sitting there stationary, it's fine and held level by the other three attachment points.
