I do not have this plane, but having set up a flight stabilizer (6 axis like SAFE with autopilot) I know what you should expect.
In stagility mode you will need the sticks centered, and barely roll the plane on each axis. The surfaces should gently point away to correct the roll.
Ex: roll right slowly and stop, should result in left aileron that does not return to center unless you level the plane.
In the normal as3x mode, it should burst the control counter to the roll, then re center immediately. (It counters unplanned movements only.)
If an axis does not work as expected in stagility check the centering of the sticks or trim for that axis. (It only comes on when sticks are released.)
You may want to check the 3d setting while holding the plane vertical.
Good luck! I think this plane will be a keeper.