After removing some horizontal shelf stringers fixed to the wall with no-more-nails product I'm left with ripped gib surface to fix up before painting.

The graded away rips are easy. The usual quick swipe of plaster it's done.

Some rips leave a bumpy edge of paper I'm struggling to prepare for plastering. This is going to be a time consuming and manual task pushing it off in the right direction with a putty knife. Is there an easier technique I'm missing?

Edit: I think I've got the hang of it. I'll keep at it..