Jeff, my alignment was right on specs. I have not noticed any real difference with the steering stabilizer either.....except the wheel stays centered in my lane a lot better and returns to center after a turn. I have read that in case of a front tire blow out, the stabilizer helps with control.
I had the same type of opinion from the tech that test drove my unit after the alighnment..........."handles like it should".
I ordered my Trac Bar from SuperSteer
www.supersteerparts.com
I spoke at great length with John Henderson Owner of SuperSteer. He is very willing to share his knowledge and the results he has seen.
The rear trac bar was $545. plus 1 1/2 hrs installation.
As I said before the rear trac bar made a noticeable difference in the handling.
I share your concern with over 50 mph driving.