If you have a swing hitch, I suggest adding a ground wire between the front section of the swing and the main TM frame. My jack uses the swing portion of the tongue as the ground point, then completes the circuit through the tongue/main frame interface, This area is subject to wear ( paint is worn away and metal rusts with exposure) resulting in a very high resistance ground connection. Easy way to check this is use an automotive jumper cable and clip one side ( doesn't mater what color) to the point where the tongue jack attaches to the frame. Clip the other side of that color to a good ground point on the main frame of the TM. If jack operates better, that was your problem.
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