He's found a very good ballance point between rushing/not rushing the tyres i guess
Vincper's allways been extremely fast in this car, plus he's got a lot more milage than you currently do (thread starter).
As you haven't posted any replay, it's difficult to say what you're doing wrong.. However, just take it easy as no one will evr be able to pull off such fast laps as the top 5 guys with little experience in the car. Take it step by step, check the cornering and (especially) the exit speeds in your own replays compared to the top driver's ones. If you do so, i think you'll have a natural progress over time
EDIT: I'm obviously a bit late, good luck anyway :P