I am also having about same issue with my blade cp now
. Got a new 4-1 and put it in and on ground tail goes left and once off the ground it spins to the right. I managed only once to keep it hovering. Let's just say I broke the tail boom very bad and had worse crash it probably had in along tme if not of all time because of this issue. I am not sure why any idea's on this issue? Sounds like same as person's abovep problem.