No doubt...Th 5700 on 3s should be faster.
In On Road though fast lap times are more inportant thant terminal velocity. 99% of the time we could gear for more speed on the straight but you lose more time in the infield than you gain on the straight so we gear for a balance of punch and and top end.
The 7700 on 6 IB4200 should be as fast as a good mod motor.