Grim Reapers Help

I have 2012 Touring 850 and I put 26x11x14 Grim Reapers on the back. My first radials and I have to say at 6psi they get us through and up everything. The problem is they rub the rear foot rest support bar/mount everyone we hit a good bump.
If I use spacers they’ll stick out even more than they do.
can I cut a little metal off each side or just let the tires wear down?