The big problem is the specs are designed for old bias ply tires so the front end needs to be set up far differently from the factory spec , you want to max the caster . 1/2* of camber in at the top & approx 1/16" of toe in to steer properly .
if there was no vibration before it sound to me like the alignment is still off , or you could have bad tires , if you have BFGarbage they are notorious for not being round .