I would go with a 81t spur and 19 or 21 pinion on an 8.5.
Make sure the gear mesh isnt tight up against each other and check brake and drag on esc isnt too high, refer to manual setup for diff and slipper setting and start from there, the slipper should go before the diff.
And running for ten to fifteen minutes is gonna produce heat on anything when these cars are typically run in 5 minutes heats
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