crt.5 gearing

HI
I'm building a new crt.5 for only track use. The race track is medium sized for 1/8 offroaders. My esc is tekin r1 and motor is Neu 1409/1y (3600kv) . I assume 2s with a bit tall gearing will be enough for proper speed and torque but I can use 3s too if it's necessary. Ambiance temperatur is 95 fahrenheit around here so I'dont want too have heat issues. What should be a proper gearing for me on 2s? I can use 3s and low gearing for lowering the heat but I'm afraid of controlling the car because of high torque.