How can I be more aggressive?

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I started playing limit HE a few months ago, and I need to work on being more aggressive. (I use PokerTracker, and although I'm happy with my VIP (around 20%) and my PFR (around 8%), my total aggression is under 2.)

I normally bet/raise when I think that I have the best hand, and check and call when I'm chasing, I mean to say drawing.
I'll semi-bluff if I have low/medium pair and a draw. And sometimes I'll bet just for no reason, or to get a free card when I'm last to act.
I'm playing micro-limits, so I'm not concerned about being obvious.

Do these seem like decent guidelines? When you pick up a good flush or straight draw on the flop, do you tend to call or bet/raise? Any tips for being more aggressive?

Thanks.