Good news, your Pitman arm is the original factory design so it's not causing bump steer.
The spacers on top of the springs are safe but that much lift, especially being 3" in the front and 1" to 1.5" in the rear is unusual... the front and rear is normally lifted by the same amount.
What size tires are installed? Are you experiencing any vibrations from the drivetrain, the kind you would feel up through the seat?