You can use 14AWG in 2wd without any issues, 12AWG is "better" if you have long cable runs. Which you should try and avoid anyway.
10AWG is really for continuous high drain applications, i don't even use it in a 4s 8th scale.
I also have used 4mm bullet connectors in line to enable motor swaps, but i use the heat shrink as a complete sleeve over each connector, it means i need to cut the tube to swap motor, but experimenting with just trying to insulate the connector just leads to the connector sliding apart under big impacts and shorting out. So a full sleeve solves both issues......
I gave up eventually, as it was just a pain in the arris to swap motors, pinions, changing set up on the ESC etc. So i bought a second car,
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