There really isn't that much you can do about cogging on a sensorless system. You need to make sure your battery delivers good power and that your transmitter throttle profile is linear. Also make sure that if your ESC can have it's firmware updated that it's running on the latest version.
Then you need to experiment a little. Brushless motors send pulses to only 2 of the wires and then looks for EMF feedback on the 3rd to try and determine motor state. It could be that you might be able to improve the motor's responses by moving the motor wire connectors on in series. For example, if it's currently connected like this:
Red White Black
Red White Black
then more all 3 of them forward 1 position like this:
Red White Black
Black Red White
And if that is no better then try:
Red White Black
White Black Red
You will never get rid of cogging on a sensorless system completely but the above might reduce it.
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