Weight is a massive problem, however powerful the engine you have. Why the GTR is still the same weight as a diesel luxobarge I cannot fathom.
Colin Chapman famously said the best tuning is to add lightness. (Lotus 7/Caterham fame).
The amazing Cayman S would be very ordinary if it was 1550kgs, not 1350kgs.
The GTR hides it's bulk well. But HOW good if it was 200kgs less!
Easy to do, too. Make it a foot shorter, 2 seats, lighter panels, less spec.