That is just plain dumb. The tech has to drive the car before and after. I have seen a tech drive my car several times after by the book initial settings because it did not feel right going down the road. He kept tweaking until the car was dead nutz on. You can set up the front end by the book with “X” brand of tires and the car handles and drives nicely, change the tire brand, and the car handles like crap with the same settings.
What is your rear thrust angle?
I recently had a front tire snap a belt on my Duster and took it in to the shop my brother works at to get a pair of used tires swapped on and get the alignment done
Did you install four tires of same size make and model, or have you mixed brands, on each axel? Used tires are less than a crap shoot, someone’s previous problem, and probably not the safest idea as tires have a shelf life of a few years in hot sunny climates, to five or six years in less sunny cooler areas of the country. Mixing tire brands by axel makes for strange handling for many reasons, a practice not recommended these days.