Should have picked a chopper with a proper. i.e. more realistic FDM for your project, the Alouette III one is terrible. I pulled 4 consecutive loops then barrel rolled continuously down the length of a runway in that, which is a series of manoeuvres the III just cant do in the real world.
Admittedly the thought of doing aerobatics with helicopters didn't occur to me at all. I doubt there's much data to be had outside the normal envelope, but inside the envelope the handling is, shall we say, plausible given other FG helicopters.
Since I lack any real-life helicopter experience, I can't really comment on details - except as I said earlier, I have no intention of working on the FDM, but I'll be happy to take merge requests from anyone who likes improving it.