i was have the same problem but i have discovered that the trimming should be done as follows :
1-fully recharge the plan
2-rotate the trimming anti-clock wise about 30 times .
3-now left the throttle stick until have range.
4-if the plan rotates about itselft then rotate the trimmer clock wise until it flys steady.
5-now use direction stick to move forward/back/left/right