The new FM is definitely an improvement and works fine in 4.12 but i think that there is still a problem with the GC of the plane and the positioning of some hooks and collision boxes
The problem with the center of gravity is because the glider was not designed in 3D-Max according to the drawings of the original aircraft. Even when transferring a 3D aircraft from War Thunder or another game to IL-2, you need to take into account many different nuances.
Some 3D models after their installation in the IL-2 have a pronounced rear centering. This can be seen in the simple editor window if you rotate the aircraft model.
The center around which the model rotates should coincide with the center of gravity of the real aircraft - this is approximately 1/3 of the wing. In default, there is also a 3D aircraft, the center of which does not correspond to the real prototype - this is the Yak-7A / B.
In the simple editor window, you can rotate this model and also the Yak-9 model. You can see that the center of the Yak-7 model is strongly shifted back.
In fm, it is not possible to compensate for inaccurate model coordinates in 3D.
Such thoughts.