Dude...how are you double clutching? It does not make your car go faster.

Double clutching is
1. Clutch in
2. shift to neutral
3. clutch out
4. rev-match
5. clutch in
6. shift

All it does is do the work that your synchros are doing. It makes shifting smoother but at the same time slower and practically worthless unless you have a car without synchros or they are busted.

Keep the F&F stuff in the movie where it belongs.