Agree with Max takeoff and overpitched. Climbing vertically would have told you if this departure was going to work. Backing up and having a "run" at it is being a Gambler. I wonder what the AU weight was before take-off.
I would be interested to know what tail-rotor this L4T was fitted with, the High-altitude or standard tail-rotor. The High-altitude one sucks alot of power. Anyone in the know?