are you running a panhard bar with your 3 link?
I am guessing that between your locker and 3 link when you turn you are actually moving that axle side to side instead of turning the wheels. If you do have a panhard bar how level is it when sitting still, is it close to parallel to the axle, if not that would be why you may be able to turn one way better than the other.
I just looked at your pictures, nice setup but that panhard bar is at a fairly steep angle. I would try to find a way to make it more level. Have someone sit in it and turn the wheel while you watch the front end, see if the rig moves back and forth instead of your wheels turning. do it out on some grass or something grippy, if you do it on your garage floor, air your tires down to get more grab so you can try and reproduce real trail conditions without taking it out.
awsmzuk