I run a 4.5 GTB profile 1 setup with 15/78 gearing, 4200 SHV's with more than average slip with slipper and have set my throttle on my DX3 to 100% out of 125%, seems to work well, motor and ESC temp around 130-140 degrees C after a 5 minute race with 30 degree C outside air temp.
For Shorter tracks I use 14/78.
Hope this info helps.
Remember second is always the first loser
Take it easy guys and good luck racing.
Damien