I did mate, found I had to push down on the top of the TIP to make sure it stayed fully on the adapter when tightening the jubilee up.
Thats a good idea mate, I had planned on giving that a go if mine hadn't shifted.
Stunning car mate I really fancy a red one or grey or silver so got a few options lol. Glad the oil pick up wasnt an exspensive repair.
http://www.seatcupra.net/forums/showthread.php?t=310084&page=12&highlight=fluttering
have a read here mate.
mine also does it on stage 1 map with badger 5 v2 tip
seems there is a bottle neck from the restrictive inter coolers and standard downpipe.
jamjay fitted 3" exhaust and forge big race inter cooler had the map tweaked and all was well
To my understanding 4th is normal chosen for logging and RR as it puts the car under maximum load which the lower gears cant.
What you are describing is surge.
Jamjays bottle neck was I/c's as it could take in lots of air through inlet and exhaust was 3" so flowed out quick but yours could be either or both of these combined
Yeah I've got turbo back blueflame and a TX FMIC with 63mm inlet/outlet. I've never had any screeching though mate.