It would seem that the torque on the main rotor blades is spinning your heli around that could mean that either your tail motor isnt strong enough because its burning out or you are throttling up too fast or your mixer gains are not adjusted properly. It could also be a combo of a few of those. I dont have a violent surge to the left on throttle up but mine does want to spin a bit I just compensate with oposite rudder when I throttle up. My brother had a real bad case of the spins and it seems his issue is a combo if a burnt out tail motor and a bad ESC.