@oglo - I've been wrestling with the same issues. Let's see if we can get to a resolution.
@cura - Is there a plan on the road map to allow the user to remove supports? The support blocker is not working as of Cura 4.4.1. The z-scarring that pva supports leave behind ruins the great visual quality that the Ultimaker can achieve.
When rotating the model to leave a face pointing upward, Cura also draws supports on top of the model, even when using the visual intent profile.
It seems that there is an issue with the Cura engine in terms of culling supports, since the geometry nor support blockers seem to block support generation in the z axis.