glitching/cogging on new 4.5

[JThiessen]

We installed my B'in Laws new HV-4.5 Pro system in his E-Maxx tonight. All items are located in stock locations, and the wires are run along the motor side. But he's getting some significant glitching from about 10 to 15mph mark - under acceleration, it stutters-bucks-etc (I dont know the technical difference between glitching and cogging). Both of my HV systems have never glitched, so I'm stumped on how to pursue this. I read in the manual to check the sensor harness (which is a little short BTW Novak...need to add about an inch to it). The capacitor is intact..we zip tied to the backside of the fan (that actually worked nice - I may change mine to put them there).
Any help would be appreciated....he looked like a kid that had his candy taken away after one bite.....