Have you measured the resistance between 2 of the 3 wires in the3 different combinations ie. between first and second, between second and third and between first and third wires? I think they should all be the same.
Also, silly thing but have you checked the gold bullet connectors are soldered properly, I remover seeing a video where somehow a guy did one which didn't work properly and had similar problems to you.
Have you heard of anyone else using the same motor esc combination?