I would worry LESS about your SPS and *MORE* about the LPS. Almost all angels have a tendency to nip at LPS corals, usually the fleshier/meaty types. Of course, some never do. And then some become Reef Lawnmowers.
Also, keep your corals *Healthy*. This is important, as wild Centropyge & other angels eat coral mucus & dead polyps. They will do this often in captivity.
And personally, I do not know any fish you can say is 100% Reef Safe at all times. This term needs to be removed from the Hobby, IMO.
Sincerely,
Matthew