With all do respect,I preserve every default plane the way they come,I think the dinamics are closest of the real life planes,you should save first the original by making a copy of the lear folder,them make the experiments with a copy,its my opinion only
I also rather fly the default FS9 aircraft because I like the closest to real. I am just playing with the configuration just to see what can be change and how to change it. I already backed up every Panel folder and air file and aircraft.cfg file for every add on and default FS9 aircraft that I have. I backed up every one so I would have a backup so If I mess something up in the configuration while installing new aircraft paints to the aircraft.cfg file or installing upgrades to the panel, so it would be easy to replace.