Running 64dp shouldn't make a difference, i would personally get someone who knows how to rewind motors to do it, you wont need to replace the copper wiring in the motor, i don't think, just get it rewound.
How old is the motor?
Defo get a fan for it, you will prob find that the fan will make the motor run cooler, i currently run a 40x40mm Zeppin fan which is mounted on the motor, the air flow is directly on the motor, basically no wires in the way. Running one of these should help.
If in doubt just gear the car down so it doesnt run so hot.
Are you running indoors? I race on a medium size track, and people i race against run 13.5 blinky with a FDR of 6 for indoors and 4 for outdoors, so maybe changing the gearing may work a little better for you, it sounds to me that you may be well over geared for running 13.5 blinky indoors.
HTH!
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