What Pilot Sports you got on? I believe the general consensus is that the best tyres for the GTI are currently Michelin Pilot Super Sport, Continental SportContact 5P and Goodyear Eagle F1 Asymmetric 2.
2016 sees the launch of new UHP tyres from each of those companies and so this recommendation may well change. Michelin are releasing the Pilot Sport 4 which I have heard will be more performance orientated than the slightly more touring biased Pilot Sport 3. Continental are releasing the SportContact 6, which is the OE tyre on the new Civic Type R. I have the Goodyear F1 A2 currently and am very impressed with them in terms of performance and so the new Goodyear Eagle F1 A3 was the obvious choice for me especially with the price difference to the other 2. My current set has lasted 35K too with rotation from front to back.
I go to a place that uses top of the range Hoffman touchless tyre fitting machines and pay £12 a corner if I remember right from last time I used them.