Corner 2: A quick dab of the brakes right before you turn in. Come as close to the cones as possible as you coast around the corner (e.i. don't give it any gas) until you know you can put your foot back down (Or in your case, your index finger).
Corner 3: Same as corner 2. Once again, make sure to come as close to the cones as possible. Make sure when you exit turn three that your car is as far, or fairly far, to the left side of the track.
Corner 4: Before entering the forth corner, put the car into forth gear so as to avoid wheel spin. This will stabilize your car as you cut from the cones on the right to the cones on the left (AKA turn 5). If you have to, you can lift a little bit, but never fully let off the gas. If you take this corner well, you should be going about 106mph out of turn 5 by the time the rumble strip ends on the right side of the track.