ifly + different model - problems ?

HEllo everybody here !I just like ifly panel and avionics very much. Only thing is that I would like to link it with some different model (like POSKY 744). I know that on some forums there was already recommendation on what needs to be changed in aircraft.cfg of POSKY to be able to fly under iFLY autopilot e.t.c. I did it but still have quite strange behaviour during e.g. turning (ailerons just wawing up and down and the turn is not nice and striaght).Any similar experience or recommendation ?many thanksJM