When you had the tracking done did you take the correct figures with you or did you say “please do a four wheel alignment”. I did the latter with ATS in Taunton and our TF behaved exactly as you describe. Having looked at the print out it was totally wrong, I took it back and insisted they did it again using the correct figures. There is absolutely no comparison between the before and after, straight line stability is perfect, turn in on corners is truly excellent, no bump steer. ATS told me that they just use the pre programmed settings, no one checks to see if they are the correct ones. 
A local performance workshop who had more than a three week waiting list for tracking told me that it happens all the time. In the good old days a mechanic would look up the data and adjust to that, most of those working in tyre retailers don’t know their a**e from their elbow. 

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