Just another redneck barrel boat - 16 choppy water and another trolling motor endurance fail

This a different trolling motor than last vid. This is a 12v 45lb Minn Kota endura. I'll start by saying it did not fail. It ran perfect for 3 hrs at full power, but then overheated which is not bad at all. I just wanted 6hrs run time (unreasonable, I know)
The run started at about 13v on the batteries and the load was 36 amps (468 watts) at full throttle. As the run went on, the volts came down a little and the amps did too until it was running at 12.1v and 32 amps (387 watts) about 3 hrs in.
It ran good to that point but suddenly lost power. The control was hot as well as the motor and motor wires. The battery was 208 ahr and I ran about 3 hrs, so I do not think it was the battery. Plus, it was still putting out 35 to 36 amps for the last 20 mins (after the 3hr run), and and end voltage of 12.1 is not fully discharged.
I may be wrong, but my conclusion is that the motor overheated from such a heavy load for such a long time. It was windy the whole time, but I spent about 2/3 of the time going upwind and 1/3 going with it.
When the motor was running properly at 400 to 450 watts, it was "good enough" as far as power, so I plan to use a bigger trolling motor and only use it at 400 to 600 watts and see if it can hold up for 6 or maybe even 8 hours.
A 24v 80lb trolling motor runs at 57 amps (1368 watts). So, I could run that at 1/3 (456watts 19 amps)to 1/2 (685 watts 28 amps) power and see how it goes.
Next time out, I think I might run the 24v trolling motor using the PWM controller at 25 amps (600 watts) and see if I can get past 6hrs continuous movement.
Endurance with these brushed dc trolling motors and wet cell lead batteries as proving to be difficult.