Hello fellow grizzly riders. My name is Brad and I recently bought a 2011 Grizzly 700. I currently have 27" mudlites on 12" ITP rims and have noticed some slight lugging, especially on takeoff. I am fixing to put on 30" Silverbacks. I am going to go ahead and do a 2mm shim mod, but just dont know how much of a difference it will make. Will it be enough, or do I need secondary spring and lighter weights to get the low end power to turn those backs? If a secondary spring, which one? If weights, all or half? I appreciate any advise or insight. By the way, also wanting to put a Rubberdown customs 2" lift and wheel spacers to give it that "mean look". lol. Any drawbacks? Thank yall.