Honestly, to me it sounds like you are overanalyzing the "problem". I never encountered anything along those lines that was really noticeable and without seeing this myself I can't imagine what the problem actually looks like. Are you sure the wrong motion isn't caused by something else?
I've stripped my code down to nothing more than a camera and one object being rendered. I'm not overanalyzing the "problem". If the camera's rotations are not smooth, they are not smooth. Some might be ok with a randomly jerking camera, I'm not one of those people.
I'll revisit this at a later time.