Only the lower speeds use a resistor. High speed voltage goes through a relay that gives full voltage. Upgrading wire to 12Ga or even 10Ga that goes directly from the relay to the battery and from the relay to the motor would lower the voltage drop and that would help some. This is also good to do with upgraded headlights and electric radiator fans. You definitely want a new relay too. Relays will get a higher resistance through the contact points over time and usage.
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