Cogging

[jcflyer]

What causes this and how to fix it??? I have a 1/5 scale truck setup for drag racing 132' with a 2028 motor 600kv running on 12s using an MGM 25063 ESC. Problem is too much power so when I turn it down the motor cogs. I am not sure about how to fix this? Would going to a 800kv motor fix this or adding a cap pack??? Also batteries are Thunder Power 4400 maH 70C, I am running a 19/54 gear setup.