I have the same issue which I've searched all over the forum to fix, couldn't find anything that worked so I gave up (my tilt is only 5 or 10 degrees so I live with it).
But here is what I don't get it. In the same way that you select whatever pitch you want in the software assistant (assuming you don't have pitch control installed) shouldn't you also be able to preselect any given tilt angle? I see the option to select a predefined tilt in the software assistant, but it doesn't seem to work.
So if I wanted to shoot at a 45 degree angle then I should be able to do it, right? This would also be used for correction of tilt in the camera due to a crash gimbal alignment issue.
What am I missing here?