My first number of dolly landings were not too pretty either, and that was the 300CB. I found the S300 to be very stable in the hover compared to the AS350, which I found extra challenging to hover neatly. (Okay, my hovering of an AS350 would never had been called neat, in the total of 3 hours I have in one!)
My untrained eye thinks it sees ground resonance develope there, and I can certainly appreciate how that could wiggle the helicopter off the side of the dolly, beyond the control of the pilot. I had to test an AS350 for ground resonance, and it scared the heck out of me! What can I learn for this? Dollys seem to be unavoidable....
FILCI, are you the most compotent pilot who ever flew? I've heard tales of him, but never believed he actually existed!