I have an X-52 Pro, and I very, very much have this issue with all of the "stock" attack jets programmed by Bohemia. I used to think that the game engine's flight model was atrocious, but then I tried some mod-pack planes, like RHS's A-10, and found that they flew much better. It's impossible to do a loop in a Wipeout, but the RHS A-10 can loop, roll, dive, climb and most importantly turn without an issue. It's clearly a problem specific to the aircraft models, not the engine's mechanics.
Right now the stock aircraft have a severe problem with turning; even a gentle, wide turn costs them so much airspeed that it's very, very easy to stall out and plant the plane in the ground. For some reason the drag penalty for turning is insanely out-of-whack. It renders the stock jets almost useless in game. With the Jets DLC revisiting those models, I hope to see that addressed.
