Bruv hit the nail on the head - it's the new sounds that are giving the impression that the FM is somehow "changed" - if you look at the gauges with the sound off, it's one experience, crank the sound, and since so much is new there in terms of how the Revs from the engine sound, the affect that's having is a false sense of loss of power/etc. I experienced it myself at first, but having flown the planes I have the most time in, I'm certain it's just an issue of the sound/ear tricking the brain into thinking you're running out of E coming over the top, compared to AH2, when it isn't actually the case.
The earlier bug I had with the reflections not resetting and sticking to "1" is gone, it's back to functioning perfectly for me.
The aileron trim bug is still there, and has an added bug for me now. Before it would trim with the old keys "m" and "," however mapping ail trim to any stick hat or button wouldn't work. Now aileron trim doesn't work with the keys either for me. Elevator and rudder trim both work with any hat/button and the keys, and I tried 4 different Hotas sticks, same result. The buttons that work for rudder/elev when retasked to aileron don't work for aileron either, so it isn't broken hats/buttons, and I tried another keyboard too, same result.