hi guys, i am having an issue with my rotary cutter and was wondering if you guys had any ideas. i have a 5 foot bush hog squealer and when i run the rpms up to 540 it vibrates the whole tractor. it is ok, at about 480 or so, but any more than that it really vibrates. i have high lift blades, that are sharp, and run the front of the cutter, about 2 to 3 inchs off the ground, to keep it off the skids. when i lower it, so it is running on the skids, i can run the rpms a little higher without the vibration, but it cuts too low and i really dont like the way it digs in sometimes. i guess what i am asking is, shouldnt a cutter be able to run up off the skids, without shaking the whole hog and tractor, or am i doing something wrong.