I took my bar off the 450 after the SHTF, and liked the added travel the rear suspension had. It rode better, and stayed more flat through the off camber stuff. The bad was it leaned alot more in the long turns at higher speeds and it didn't corner at all. Just pushed in the turns. My new Sport is amazing, there is no comparison. Seems being a little wider in the rear lets the back slide more, and the front tires bite more in the corners. Some of it could be the sport shocks, but I think the spacers in the back make it much more stable and faster in the turns.
I won't change wheels, tire size, or anything because I would never imagined that a rhino could corner like this.