WOW congrats, that must have been a heart pumping ride. It has funny similarities to when I learnt to fly my model heli way back when. Another similarity that might cause problems is the vibration you notice in the left skid tube, that combined with the engine note REALLY reminds me of my model when the engine is running to lean and out of balance. The end effect on my model was parts breaking due to vibration, so please tune the engine nad check the balance on the output shaft. Not trying to scare monger just passing on my "similar" experience.
Well done though, I am mightily impressed
Si