So much for so-called "improved" air files!!

I have had problems flying the default 737 using autopilot. Was getting oscillations in flight -- in spot view, the aircraft looked like a rocking horse!! Asked for advice in this forum - received a couple of suggestions which did not improve matters. Then I remembered that I had replaced the default Aircraft.cfg and associated air files with those from REAL AIR SIMULATIONS . So I put the default ones back in -- problem solved!!Barry