Oh, don't get me wrong; I've been flying, though as of late it's the wind that keeps me grounded more than anything. I am by no means a multicopter veteran as I have just recently built my first quad (an Electrohub). What I do know is that balancing the props is very important, I noticed an instant improvement in performance. However, poorly balanced props should not cause such a drastic effect. Two common issues that lead to a fast flip that I have learned about are 1.) ESCs not being calibrated, and 2.) P/I Gains at incorrect settings. There are plenty more reasons it could be happening, but those seem to pop up quite a bit in the forums, etc.