grosporina

My question to you then, is the swashplate level? If not this can be the cause. I too had the same side to side action and I leveled the swashplate. Seems when I got it out of the box the swashplate was tilted to the right side a little causing the heli to veer right.

The position of the battery can play a roll on the heli moving forward or aft without any input. The swashplate for the fore and aft movement was also leveled and if I notice the heli moving forward I just move the battery back a bit.

I do have the cyclic trimed to go right a bit to counter the gyroscopic movement. Like I said it took several hours and messing with it to fly the way I want it to. I'll have to record a video of me flying to show how stable it can be once it is properly trimmed.

Let's not forget those two blades that are rotating. If they are not balanced as well they can cause some serious problems. I noticed that when I nick my couch the blade tracking would be off and the rotor shaft would vibrate causing the whole heli to vibrate bad on mid-low throttle. I would also observe this wild vibration coming from the tail motor. It would bounce really fast off the floor. Once the blade tracking was adjusted once again it stop vibrating wildly and the stability was once again as normal as can be.