I have Been flying for about two weeks. I had it outside and was doing loops and rolls. Well i have a few trees in the yard and i thought that i was going to nail it. I cut the juice off and realized that i was behind the tree. I powered up but it was to late. It landed perfect but hard. Well I replaced the main shaft, blade grips, bearings in the main shaft, center hub, tail motor, and tail shaft /gear. There was nothing wrong with the tail motor but i replaced it anyway. When you bring it up to a hover it is ok. Well if you throw it fowards fast and catch it, when it changes from foward to reverse it starts bouncing or wobbling. I am hovering tail in. This may not make any sense. I don't really know how to explain it. The tail boom starts bouncing up and down. Before i crashed it was solid. You could throw it foward and then bring it back and it never wobbled or bounced a bit. I have tried everything. That is why i put the new tail motor on. Someone mentioned that the headspeed was low and the tail was pulling to much juice. It comes up to hover fine and it flies around ok but the wobble causes it to be unstable and dangerous. Please help before i set fire to this thing.