Wheel Alignment

[rg1642]

Anyone out there a wheel alignment expert?  I am trying to get my head around 4 wheel alignment. I bought myself a second hand Balco set that had recently been calibrated. I put the gizmos on the wifes car ( I have had some basic training) and although the rest wheels adjusters are solid they are only a tiny bit off. When I square up the front and back wheels the tie reading In getting is +6 on the off side and -6 on the near side. Now I know this cancels each other out but it seems they are large figures. What I want to know is if this is ok or is it highlighting another geometric problem? The card a MK1 Focus hatch 2003.

 

Thanks Russ