A lot was changed on the flightmodel side in XP 11, this is one of the reasons it took took us a while to get v 1.2 out. The XP 10 versjon flightmodel took us 3-4 years to perfect, just to give you an idea. So you will notice subtle differences at this point.
Lift, drag, thrust, groundmodel, controlsurfaces efficiency, groundeffect, also the default sensitivity sliders seems to have changed somewhat. This is alll very complex stuff but we are well inside the Ballpark on v1.2. However we will still be tweaking the flightmodel in the next updates where necessary. Also, we can expect Austin to further tweak on his end, which means we also will have to "retweak" again. This is just how XP works, and in the beginning of new XP version runs it is always a tradeoff, should I jump to the next version or wait until things settle and aircraft are 100% back. This offcourse goes for all aircraft not just IXEG