[EC900]

I experienced a bit of this when I bought new tires,(F150) nothing harsh more of a wandering to the right, like a low tire. A $100 alignment check didn’t find any major problems how the suspension was set, maybe a degree here but not there.
The theory is that the new tires may take time to get accustomed to the old suspension. Everything seems fine now after a few hundred miles.

Ruled out the low air tire pressure, maybe the old tires are responding to the new, tightened tie rods? Any obstructions in the smugglers box at the steering wheel shaft or worn u-joints ? The steering rack could be just worn out, and not mating well with the new T/R’s?

I’ve found suspension can be finicky, so many other worn components affects the new parts operation. i.e. replace just one side, upper/lower, left/right, etc. such things can respond differently when something up or down stream is changed out, the symptoms of the bad rack are more of steering effort and wheel returning slow to center on turns, maybe some slack issue too, but my experience on that were with hydraulics.

Can’t say if re-adjusting the TR’s to non-spec align measurements just to try and eliminate or compensate is proper approach, which probably can be done but not w/o maybe creating another issue. But the TRs is where I would triple check if a worn high mile rack isn’t the problem.