[Mr. B]

AL, I am not sure of the correct terms to describe what we have seen, but with the victor, when the motor is loaded to the max, the motor output continues at speed and torque(I assume this is a peek condition). The Jag will start at full speed and torque but, slowly the speed is reduced until it faults out like you have described above. In 3-4 sec it will start moving but again it will slow down and fault out again. My assumptions are:
The Victor will continue to put out a Peek current while the Jag circuit requires the Jag to fold back to a max continious causing the speed to decrease. When we look at the voltage output to the motor with a scope, we can see a decrease over time, therefore because V=IR the current must be decreasing.
Note, both controllers were tested with the same set-up.