I have noticed a problem with deleting hidden pieces of geometry. What I do is I go down to subdivision 1 and then I hide a piece of geometry I want deleted, click delete hidden, and when I look at my hi-rez sculpt with deleted geometry I see that it has lost much of its detail, as well as pinches or jagged transitions.
I am going to assume that when you delete hidden, it automatically performs the project all task. I have been using the re-project higher subdivisions various times on my sculpt with great results, but as soon as I delete hidden my sculpt gets messed up.
Has anyone else encountered this issue? Or does anyone know of a way to avoid it? Thanks in advance.