The steering link that goes from the pitman arm to the knuckle arm MUST be parallel to the ground. This is what your dropped pitman arm is supposed to accomplish. If the steering link is on an angle to the ground, then it will try to turn the front wheels slightly as you go over uneven terrain.
Like a previous poster mentioned, check your toe setting. You can do this at home easily with a couple straight pieces of wood or aluminum a tape measure and a couple of Guys. If you have ANY toe out, the the thing will be impossible to keep on the road. Aim for 1/8-1/4 inch of toe in.
Do you know what offset your front rims are? Another contributing factor to crappy handling is too much scrub radius from having too much negative offset.
You'll get it figured out.
Dan