Glad you found a solution, and hope you got your money back on the bad Maximizers. Here is the one I made, a $13 PWM module from ebay and a plastic box from Walmart. One set of wires goes to the breaker+battery, the other go to the TM.
It is best to bypass any speed control circuit in the trolling motor, and connect the controller directly to the (fat) power wires going down to the motor. I assume that is what you are saying about the power drive, not sure I understand what you wrote.
"Alive without breath, as cold as death; never thirsty, ever drinking, all in mail never clinking."