Essentially what you are asking (as in the hand above) is how do I bluff a fish off top pair?
It's not really much to do with aggression (well not proper "thinking" aggression), it is more to do with understanding the mentality of fish. It's hard enough to bluff fish off their underpairs...trying to bluff fish when they think they have the nuts is basically torching money.
So don't do it.
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This is a double edged sword thought because the more I get caught bluffing the more people will adjust and call me down lighter.
So now you are going to called by the stations (who never adjust) and the regs who will adjust.
I think you've kinda answered your own question.