I'm looking for something like a maximizer for my jon boat tolling motor. It has a minn Kota edge on it now it has 5 speeds but I can't fine tune the speed Like I want and hate to go and buy a power drive for nearly three times the cost what I could get for the edge used. Is there something like the old maximizers out there or rig something up like a dimmer switch? My big boat has a maxxum I use the jon boat in small lakes that has hp restrictions