It sounds as though you have a very good grasp of sharpening scrapers, but perhaps need to spend a little more time burnishing the blade edge and face before turning a shallow angled hook.  Edges need to be very well polished in order to produce polished end results and I find the hook is best kept as small as possible and at a shallow angle.  They then bite into the surface more readily and tend to leave a more polished finish.

At what angle do you find your scrapers work best? 60 deg to the surface or less?