[soah]

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representing the ace heads up can always be an opportunity to bluff in either limit or no limit

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You can certainly TRY to represent the ace whenever it flops, but you won't always be given credit for it, and sometimes your opponent will have the hand you're trying to represent.

In the example I posted, with five people to the flop it should be "obvious" that someone has an ace. And when I called there were still three players to act behind me, so I can't be calling with trash with the hopes of launching a delayed bluff... it turns out I only had some straight draw or something, but my play looks completely consistent with a made hand to everyone else. And when my opponent gives up control of the betting, it's telling me that he's giving up on the hand. So my bluff here is good because my previous action in the hand is consistent with the hand I'm representing, and my opponent is showing weakness.