It would depend on how the thin wire is coping. If your not asking it to perform to it's full potential then going thicker won't do much for you with current LiPo/brushless instalations.
If the wire is showing no signs of stress (staying totally cool to the touch etc etc etc) I'd leave it till you need to replace it then move up to the 12swg stuff (mainly becuase its easy to get in nice supple insulation)
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