The cutting & grinding I did was all on the Rzr
I beveled the square frame ends at 45 deg., cut the corner off the motor mount bracket and cut the overhanging plastic corner on the skid plate:
The interference is all when the suspension is hanging down. It actually gets better as the susp. retracts.
I like the Terracross tires a little better for handling. Seems to have better bite on hard-pack trails. I haven't been in mud deep enough to see which is better for that.