"Do you have any documentation on its proper flight handling?"
No, who does? The majority of Aces High planes are modeled without this information so they can practically model them anyway they like except for weight, power, wingloading and wingprofile and resulting figures for speed, climbrate and approximation of turn performance. There is no information on rollrate, controller responsiveness, control harmony, acceleration, stability and compression effects or combat/damage endurance. Of course eg. the weight of the aircraft is a clue for certain unseen values if the manufacturer has not chosen to weight the plane down with blocks of iron, nobody did to my knowledge.
The "fine tuning" is just a best guess if anything as there is no such detailed information of majority of these planes.
***
"You'll need more than just inferences and "common sense" to get changes to it."
What information did people have when Mossie got its stability "fixed" to a state that it can be flown even without its vertical flight surfaces? A plane that IRL had to have its engine nacelles made longer and bigger to assist in directional stability, and it does not even have slats to assist in keeping the airflow steady on its thin (13%) wingprofile. Yet it is in every way more benign than 410. To me it doesn't add up.
I'd just like to see the same generosity for Me410. Pretty please.
-C+