For all of those still following this topic. I have a 2013 TDI and I have never had this problem. I have 4 other VW’s so I am an accomplished home mechanic (or I would be broke). I have the stock 19 inch wheels with factory Pirelli tires. In the winter I switch to aftermarket 18 inch wheels and Michelin X-Ice in factory size for 18 inch wheels. I have the TSB and have followed it which is a little tedious but certainly works. I have also just mounted like I would do on any other car, again no problems. I have my own best practices for mounting wheels which I have been using for years. First if you threw out those pesky two piece bolts and installed studs (or someone else did), dig those back out and use them. Apply anti-seize to the mating surfaces after cleaning them with wire brush and brake clean. Anti-seize on the bolt threads and cone washers. Use the wheel hanger stored with the jack, or pick up a 14mm x 6 inch bolt and cut the head off, to mount the wheels. Snug up all the bolts by hand so that the wheel is still a little loose. Firm the bolts up shaking the wheel to accurately set the cone washers. Torque all to 80 pounds and lower car to ground. Finish torque to specifications. Only rotate front to back, surprising how many people think it is still corner to corner. I like to think I can re-engineer things to make them better but I have learned the hard way that auto engineers have a good reason for everything they design. Remember this is a Porsche that says VW on the grill. Not all tires meet Porsche specifications for balance (with out balancing) just because they are the right size; look for a “P” in the tire specifications, look for “meets Porsche P0 or P1”. If your local tire store doesn’t know what your talking about find another store. I would like to know from others if it is the 20 inch wheels that are causing problems or if problems occurred after replacement tires were mounted.