3 stars in the last level against Chuck

Hi, did any of you get 3 stars in the last level from page 11, the race against Chuck ? I already upgraded the most powerful cart from Stunt to 300, maxed out, also used Chuck as driver a a Power-up via ads, but I still ca't get 3 stars in this last level. I think I got around 87,000 max, but was not enough. How can I do this, any advice ? What kind of driving can give more points ? Thanks.