suspension
I'm a little nervous on this. Trust my judgement here, I'm no chassis expert like others on this board probably are.
Given what you're telling me. If the bars are adjusted unevenly, if you take a tape and measure center to center of your wheels, front to rear or vice versa, your measurement ought to be squirrely. Your front to rear measurement should be fairly square, I'd say at worst within 1/32 - 1/16 of an inch at worst. You get the wheels out of wack, the car is gonna track real funny, as in dangerous. Heims adjusted too far out create another dangerous situation. I know this first hand, really sucks when a heim comes out. About wrecked my car at Terre Haute, Indiana over this once. Had the heims adjusted with too few threads in the bar, under hard accelleration, the heim pulled it's remaining threads out.
With ladder bars, adjust the heims out, you move the rear in or out, to move the angle up or down, you move the bars up or down. This still doesn't address your side to side bias. Unless what you're saying is, one side of the bars are set up in a different hole than the opposite side?
I'm only throwing this out because I'm preparing to put a 4 link under my old car that has been parked for 20 years. I've never done a suspension myself, I'm more than a little nervous. A friend that has built a couple is helping me, so, I'm having to put alot of faith in his judgement and abilities. I've seen badly set up cars do some equally dangerous things.
I'm going back to my first post. Find someone with chassis knowledge and have them crawl under that car with you.