[BradleyGT]

definitely dont keep the front tighter than the back. thats your first, and possibly biggest mistake so far. tighten the back end up pretty snug to start out with and keep the front turny. like someone said already, the wobbles come from the back of the board, not the front. also, make sure you are putting the majority of your weight on your front foot and taking as much weight off your back foot as you can handle. it will make the back end less twitchy.

if that still feels weird, then yeah, try harder bushings.