- Phew! (had to ask though, sometimes its the simple things and I forget my head ...) I'm guessing a badly adjusted Panhard would just knock the steering off-centre, not cause it to wobble. Assuming you've done everything up properly, then that probably just leaves a problem which existing before (like incorrect swivel pre-load) or your new 'box is faulty.
- I don't know about 6 degrees myself, sorry, its just the only other thing I could think of!