Brushless Maxx hesitates

[steve050773]

I have a supermaxx with a 9920/1940 7 turn hi amp, running a UBEC, spektrum, and 14 ib3800 cells with deans. The motor is wired to the controller using 3.5mm plugs. Motor has a heat sink, ESC has a fan.

The problem is hesitation in mid acceleration. Its almost like cogging yet its after the truck is well under way. Its hard to describe, but it looks like the hesitation you might see if a truck were shifting from low to high. Just a momentary pause and then its off. Of course, my truck is a single speed so thats not it. This has happended with gearing 14 to 16 on the pinion/51 spur.

Any thoughts on what might be the issue?