I use a % of 80/20 playing AA, KK, QQ aggressive - meaning this, 80% of the time I play them aggressive & 20% I slow leak them. This all depends on the situation of the table (type of players, positioning, etc).

I find that large pairs are better being played aggressive, but more money in the slow leak. Is there a better feeling then calling before the blind and hitting trips on the flop - now you can make some money.