I got a serial lead for my FF6, took a while to work, but its great, i find the planes are unacurate, alot if it depends on who programed it, but i have 3D planes that are just stupid, i've played with the files, but giving them real figures kills the hint of 3D.
As to height, it took me a while, but im finding it has more to do with how much of the bottom of the plane you can see when its flying level, a skill you can only get from real flying, and something you have to re-learn for sim flying when you cant move your head.
I cant fly heli in real life, but im finding the helis are alot more realistic to fly. I.E not like the Su-36 i have which is better than a 3D Seduction!!