Most cheaper trolling motors have notoriously inefficient speed control circuitry. So one way around this is to bypass it all, and use a cheap PWM controller. This way you can use a higher voltage bank, too, and have "overvolt" power available when you need it and don't mind the extra wear and tear on the motor. The rest of the time just keep it down to rated power level and bobs yer uncle.
The cool thing about cheap trolling motors is, well, they are cheap. Cheap enough to carry a spare, ready to rock. The amount of cooling from the surrounding water depends on several factors, such as actual speed through the water, and water temp. A lot of guys get away with doubling the voltage. Let's just say, YMMV on that, and if you are engaging in risky electromechanical behavior, you should have a spare motor. You could also set it up as a twin screw, if you can find a left hand prop.
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