Are they unable to shim the control arms enough to correct caster? How much is the reading off ( - or + ). When installing the upper control arm shaft and ends, its possible to have the shaft forward or rearward by 1/4 or more which throws the caster WAY off.
Have them do a SAI (Steering Axis Included angle). If its off by a few degree's or more, the frame is diamond shaped and will need to pulled. If SAI is ok and Camber can be adjusted ok, it sounds like they may be doing something wrong with the upper arms.
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