The rules of alignment are as follows...
Two things cause pull. Caster and camber. The car will pull to the side with the greatest positive camber or the least positive caster.
Two things cause wear. Camber and toe. Outside right wear usually indicates too mush toe-in, and inside left usually means too much toe-out, assuming the camber is correct.
Wandering is caused by toe. Since they changed a tie rod end it's more than likely toe. Probably too much toe-out.
If it were mine, and since they're going to redo it anyway, I'd take a few minutes to just crawl under it and adjust the toe until it seemed better. It can eat your tires up in a hurry on the highway. You can make a simple device to measure toe with a couple of carpenters squares and a piece of 6 foot angle iron. Clamp the squares to the angle iron, and measure the difference between the front and rear of the tires while the car is sitting on level ground.
|Rear Toe in (total)||0.000||0.060"||0.125"||0.032"||0.032"|
|Front toe in (total)||0.000||0.060"||0.15"||0 to 0.032"||out 0.032|
|Front caster*||-||2°||-||3° to 3.5°||3° to 3.5°|
Note* Front caster is only chnaged by using a different (real
Cosworth Sierra for example) front sway bar or relocating chassis
end of sway bar.