SC10 gearing

[RCcool101]

Hi guys,
I got a castle sidewinder sct and 3800kv motor for my SC10 and am having trouble with the gearing. The gear chart calls for a 14-18t pinion on an 87t spur, so I naturaly went for a 16t, all the guys at the club reckon this was way to small and I was lacking top speed massively, temps are about 74-76 Fahrenheit with this set up, What gearing do you recommend?

Any help is appreciated.