Question for you madmanmart only out of curiosity really those wheels your running the tt ones are they 17" only asking because i thought it would be better to be running 15-16" rims as they perform better ive read even some lightweight wheels like pro race 1.2's or something would save weight over all wouldn't it ? don't get me wrong here not tying to say its a bad choice as ive never been on a track just curious 
Your totally right, in a ideal world I'd be running 16s bit those TT wheels were on a mk3 that I broke for spares.
Also I when down my local tyre place to have a look in the tyre bin and they had a set of part worn 17" toyos he said I could have for free so its just the way it worked out.