Belle. because such a low profile and wide tire, the tire will seem to ride the worn grooves in the pavement. your axle in the rear is moving side to side along with the front. to correct this, get a Panhard for the rear and if you have bumpsteer, get the bumpsteer kit from Maxium Motorsports, then put your C/C plates on and get it aligned.
did you check your front end for tightness? tie rod play, ball joint and even bad hub bearings with cause a wander or a side to side ride. ths intensifys with wider, low profile tires. check the front end tightness and go from there. your quad shocks have nothing to do with the problems you mentioned above. they are only there to prevent axle windup.
__________________
Cobra brakes are on! Finally.....
------------------------------------------------
|