I see your top speed is some 7mph lower than mine, maybe you should play with the gear ratios some more. With 155 I bet you hit the redline some 100 meters before the end of the straight, longer 5th gear could help you shave some tenths of a seconds. Also give it a lot of pressure on the brakes, I run on smth like 22/20 and racing flywheel and boy does it stop . When I get back home I'll post my settings, maybe you could help me improve them