Sage words Matt, regardless of the poll these little beauties can change.
I recently did some more research on angels an it appears that sometimes they change just due to there constant grazing or foraging nature. And, I suspect over time their nutritional needs change as they mature adding to their desire to nip. One practice is to feed less food but more often (like 2-3 times a day), to sastify the need to forage.
I'll add a couple more drawf angels and then move to some of the wrasses