The manual says the adjustment in post 13 is for something else entirely.
That said, the description sounds like the toe is off, which should have been fixed by alignment. I wonder what the shop said the toe, caster and camber are/were.
https://www.google.com/search?ei=Phc....0.risBAJkM7Lc
See if there's a steering damper, or brackets for one. It's basically a horizontal shock absorber that limits quick changes in steering.