"it road walks real bad when I hit a bump"

That sounds a lot more like bump steer than improper caster. Is your drag link still parallel to the ground? What type of power steering system are you using, and is the steering geometry correct? It sounds like the excessive caster is a "band-aid" fix of a more serious, possibly dangerous problem.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!