Originally Posted by burnineyes

In my experience, a full throttle cogging like that is almost always caused by a weak battery or poor connections somewhere between the battery and motor. The fact that it starts better when you give it throttle slowly tells me the problem happens when current draw is high. 6000mah 25C should be enough to power either of those motors assuming it is in decent condition, so I would look to connections first. What kind of battery and motor connectors? Have you replaced any of them? Sorry if this has been covered, it sounds like you have posted something about this before but I am not familiar with it. Is this a problem that started all-of-a-sudden or did it start with all new components?