could try gearing to speed it up but id fix the weak links first such as:
front tower flex
front suspension fibre bar
RPM suspension arms
what i also did on my stampede was remove all the grey upper plastic turnbuckles and made custom ones with 3mm threadrod, alloy tubing and nuts to back em off.
just a few ideas....
Venom fireball 60t, micro Drive 14t ESC, micro rx, HiTec 645mg servo, and still working on this...