Rear calumets are known for sticking.
How hard was it to wind in?
Go for a drive let the car warm up but don't brake hard. Then stop and quickly check the wheel temps. If the left side is hotter, you have sticky caliper
Sorry to state the bleeding obvious but he meant calipers.
If it is not that then...
You should check everything that holds your front struts in place for play - or get someone else to do it. Track rod ends, wishbone bushes, strut tops, drop links. It sounds to me like something is loose that gives you good numbers on a ramp but on the road the geometry is 'going west'.
Maybe pop in to your local while-you-wait MOT centre and get them to check it all for a tenner in hand?
My Mk3 doesn't pull at all, so there is something definitely amiss somewhere with yours I think.
