thanks for trying to help, but it's not easy. I have given up months ago...
garages here in Portugal are really bad and even SEAT couldn't fix it, I doubt most of the garages I went even tried though. then I staerted doing things myself but never found the problem.
only thing I found is the rack making weird noises sometimes, not noticeable while driving, but pretty noticeable with wheels of the ground and engine not running, an example of the quality of the garages here is that I went to at least 6, some more than once, and none of them even notice this...
two noises:
https://www.youtube.com/watch?v=74gyV3EO_Wo
https://www.youtube.com/watch?v=6P6dKb1-hL0
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