In some cases, what I would do is set your voltage cut-off to around 3.5 volts per cell. It will shorten your runtime, but it will act as an amp limiter, reducing the current to keep the cells above 3.5 volts. You will lose initial punch, but you will keep most of the midrange punch and the same top speed.
Check out my custom converted 8ight:
Sub 7lb, lowest CG of any 1/8 buggy