Tekin Hot Wire Help.

Hi, I am using the Tekin hot wire,
I am Running the Tekin 1700 Truggy motor and RX8 with 5s 5800 battery.

Under Setup, then the Timing Proflie, The chart goes from 1-5 then C1-C2.
Looked all through the manual and couldn't find out what any of these really mean.
The defualt setting is C2 (right at the top)
Is this the best place to leave it set at, or should I be looking at something in the middle, say around 3?

Had it out at the last meet, the top speed down the stright was way slower than it should be, even slower than the nitros, played with different size pinions but still didn't get there. (the stright is a fairly long one.)


So i guess any information on the Timing Profile would be appreciated.

Cheers.