Yeah, same here.
Moving the C.G. backwards and increasing the wing lift percentage helps to deal with the stalls, etc.
For the coupling drop the "Z" of the engine a bit.
I believe I made all of those changes to get the sim to perform more like the real world.
I often knife edge the real Reactor 3D at low altitude along the entire length of our club airfield runway with no problem at all. I don't have to fight any coupling when doing so.