[Al Skierkiewicz]

First thing to check when in full throttle, the Victor LEDs should come on full brillance either Red or Green to indicate that the Victor is receiving a full throttle command. If this is not happening, your Victors may need calibration. Consult the manual for the 884, it has a full calibration procedure. If the LEDs are showing full throttle on both sides, then there can be one of two problems. Either you have significant losses from mechanical friction or electrical resistance. The mechanical friction can be checked with power off and wheels off the ground. Just turn one side and then the other. If one side is hard to turn, you know where to start.
If mechanical is not the problem, then check electrical. You can do this in a variety of ways, but a voltmeter at the power input of each Victor when driving will indicate if you are receiving the same voltage at each Victor. If you have several feet of wire in the slower side, that might be the problem. Double check all crimps and screws. Electrical losses usually mean heat so any connection that is getting hot would be a good place to start.