I had the same problem with my edge. I am running a YS 140 and balanced my edge to the book specs. After several near fatal landings I went in and changed the cg. Now it is a whole new plane and enjoyable to fly. I have read the other posts about a warped wing and the like but I will bet the cg is all that needs to be corrected. I think that if you set the plane to balance on or slightly behind the red trim strip at the wing tips you will find your problem solved. In my case after moving the battery pack all the way to the fire wall I still had to add some led to the nose as much as it pained me to do so. My edge now weighs in at 12 lbs 6 oz. I hope this is of some help to you.