Whenever you see their "face" on Angel or Spike its always when their mad,so i am thinking the only times you see a "vamp face" is when their angry or trying to eat, and sometimes just to scare ppl.
Actually I think they are stronger with their Vamp faces on because they have more rage. For example in "Reptile Boy" Angel changes fast because he knows Buffy's inside, probably in trouble! The have more rage and their natural instincts come out and that gives them an adrenalin rush. Meaning so they probably hit with more force so I would say yes! lol sorry its so long!
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