If the motor is getting hot, you want to lower the number of teeth on the pinion.
Don't know the size of the track, but I use a 24/76 on a 7.5t SP motor on a large outdoor track.
For a 6.5t esp a quick 6.5t I would of thought circa 21t would be about right.
If your gearing is too talk the motor will be drawing more amps hence getting warm quickly and the batteries not lasting as long.
It's a possibility.
Is the speedo getting warm too?
What capacity are the batteries?
On a 5min stint on a 2wd I use typically around 1500mah, so batteries not lasting suggests large amp draw, which could be incorrect gearing or something binding.
Yes the octawind run a bit hotter but they should last 5 min...
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