make sure you have the cupra solid bushes put in (if you still ride on standard bushes you may be able to get them replaced free of charge by SEAT if they're causing you grief)...i had tracking problems a few times in the first 2 years of ownership which went as follows:
1. standard factory bushes split, replaced under warranty by SEAT as these were VOID by SEAT UK with revised VW web-design model
2. web-design bushes split, replaced once again under warranty by SEAT with solid CUPRA bushes (never had a
problem again, ride remains unchanged)
although i got SEAT to do the final realignment it hasn't been out since and have had a few pot-hole scares in the last 1 yr and half! According to SEAT it was a known
problem that other bushes have a lot of play in them, supposed to give more ride comfort, but tbh it felt the same with the solid CUPRA ones in
hope that helps in any way...