I had a new set of slicks do the same thing . Checked roll out several times and both were the same . Ended up having 1 sidewall being stiffer than the other . Rotate the slicks side to side and see if it pulls the other way .
Take a plumbob and drop it from four points under the car at the pinch welds determine center and draw a line to the rear of the car. Then find center on the rear end and align the two. Dave Zimmerman posted some instructions on here similar to this years ago that's how I learned