Boost Creep: my experience was the same. Surprised to see the numbers as I did have the car on the rack at the 7000 mile point in the states at a reputable shop. Now 8000 miles later is consistently toe out. Germany uses majority of asphalt surfaces so assumed the lorry grooves was the cause. Still does it, but not nearly to the same degree.
FNxR3DNECK: Likely watching a few of the real ring kings will get you farther than watching my mistakes...:-)
Import Racing is north Stuttgart - may be a bit of a drive for you. Nonetheless, link:
https://www.importracing.de/
They also mount tires, so relieved to find a good shop that isn't challenged (and not restricted to the post offerings.