Fishking, I am NOT an angel expert! I do want to get into raising them, but there are many here more knowledgeable than I am. Hopefully this will get some more attention form someone who can answer you with more conviction.....but here goes.
I
believe that as a species cichlids are Usually good parents. MANY are even considered excellent, even to the point that they can be left in a community tank and they will defend their fry.
As you say, angels are highly domesticated, and over the eons many instincts can be bred out. I have read about how favorable it is to have a mated pair who raise their own young! Seems that
IF they will, the resulting offspring are all-around more vigorous fish....they are taught to eat and so on by the parents. But I THINK, most breeders remove the adults after the fry are wigglers......Now this is like I said, something I am just learning about myself. I do think that once a pair is known to eat their fry, you shouldn't trust them and remove them as soon as the fry hatch. Maybe next time, if you have all other fish out, the two could get back to egg rearing, and at least won't eat them at that stage...... Let us know what happens!
And they DON'T use any paragraphs, so it is hard to follow...hope this helps...