Mike a few comments:
In post #17 you talk about swapping trucks to regain better short hood operation, so I guess that is where you decided to swap them, but nothing changed according to post #20.
So, it would infer that nothing wrong with trucks. Could it be as simple as inadequate power combined with more lamps running forwards than reverse? (less currend drawn in reverse due to fewer lights, thus better running?)
My opinion is that the pack you are using is wrong for G if it tops out at 12v, and the MRC 9500 is rated 30VA, so 2 amps draw at full throttle would be maxing it out pretty much. Also, never trust meters in an inexpensive system until you check them with another meter.
Another item: the pulse power "goes away" around 5 to 6 volts on the output, so if you have heating of the motors, you most likely have a different issue.
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