The over heating of esc's in boats at low throttle and on and off throttle is mostly because of parasitic drag, Airplane car and boat controllers are pretty much the same. How come I can run my Rc cars and planes on off on off all race and flight long. To accelerate a boat from off plane to on plane draws so much more amps than a car or plane. Remember your boat is in WATER, when you come off the throttle the boat wets down and then all you have is that little prop to get it back up to speed. For example I have a 1/5 scale 4wd on road car, it does about 60mph with a castle 2028 on 8S and I can get about 9 minutes of run time on 10,000mah going on and off the throttle the whole time. In comparison my sprintcat with the same motor on 10s and 12,000mah I get about 4-1/2 minutes running at 65mph. and thats mostly at full throttle for an offshore race. My huge 80 inch plane on 5000mah gets 7 plus minutes doing all out 3D maneuvers. The water is the limiting factor, when you go slow more of your boat is in the water and thus uses more amps to push it through the water.
We call ourselves the "Q"
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