September 24th, 2016, 08:01
BendyFlyer, since you seem to enjoy fixing up and improving aircraft, why not invest a few dollars in the Airwrench utility.
As long as you have good data about the aircraft engine and performance, you can easily generate proper flight models for these aircraft that hits the performance numbers in all flight phases.
Afterwards you can tweak the flight model for the handling you think is most appropriate for the make.
Now there is also packaged with that utility an GUI interface that allows tweaking by air file table with just point and click on graphic interfaces.
Hard to beat these FM results for just ~$24 US.