2011 550 Tire consideration

I’ve been looking to upgrade tire sizes on my 2011 Grizzly 550. Currently I am running 26x10x12 ITP Mud lites in front and 26x12x12 mud lites in back on STI HD rims. All my crew is now running 27 and up, leaving me with the smallest tire.

My 550 has never had an issue with turning these tires in mud but I did recently upgrade my clutch. Now it really spins them.

Looking to go up to a 28 inch tire but do not wanna sacrifice power. Any thoughts? Will I have clearance stock? Will it turn them? What tire so you recommend?