Uncle Albert, DickyD suggested that you change the wiring on one of the motors, yet photo 4 shows the same polarity on each motor. I use a P94 in my Armidale patrol boat, and wired the motors so one rotated left and the other right, simply by swapping the red and black wires on one motor. The red (positive) wire is on the outside terminal of each motor.This works both in forward and reverse. Photo below.
I also notice that Dave suggested you send the P94 unit back to him for testing and/or replacement if you thought it was faulty...have you done that?