I'll just add this for an example.
14/44 Gearing:
2nd Gear @ 8,000rpm = 29.1 mph
3rd Gear @ 8,000rpm = 35.1
4th Gear @ 8,000rpm = 42.2
5th Gear @ 8,000rpm = 50.5
Stock Gearing (14/41):
2nd Gear @ 8,000rpm = 31.2 mph
3rd Gear @ 8,000rpm = 37.7
4th Gear @ 8,000rpm = 45.3
5th Gear @ 8,000rpm = 54.2
15/41 Gearing:
2nd Gear @ 8,000rpm = 33.5 mph
3rd Gear @ 8,000rpm = 40.4
4th Gear @ 8,000rpm = 48.5
5th Gear @ 8,000rpm = 58
While, the differences aren't huge, he's got you on mph right from the start, and there's no way you can stay there, mathematically impossible. Your shifting a little sooner than him, but you'd have to be doing some fast ass shifting to make it work. By switching the gearing around, your turning the tables. The secret to speed is finding the highest gearing your machine can pull without sucking the motor down (gearing it higher than the motor can handle). Try a 15/41 and get back.
[Damn i must be bored.....]