Dude, you totally have bumpsteer wrong.
Bumpsteer is the change in steering as the wheel runs through it's range of travel. From fully compressed, to fully extended.
If you have a ATV stand, put your banshee in it. Take off one front shock. Center the bars, and move the free wheel up and down. That change in steering is bump steer.
No steering stabilizer will cure faulty suspension geometry. Wheel spacers only move the wheel, not change the suspension action, thus no bumpsteer change.
You change bumpsteer by adjusting the relative mounting points of the upper and lower a arms to the frame, as well as the tie rod to steering stem mounts.
Don't mean to bust your chops, but you got it all wrong.