I agree with Stacks. If you don't want to open 99 with a raise in no limit, believe it or not, the second best thing to do with it out of position is fold it, not limp it. You can limp or call BEHIND with it if you want to setmine, but if you are first to act, it's either raise or fold.

As for what to do after the flop, the reality is, since you posted the results, that when you flop an overpair on a dry board and your opponent has a bigger overpair, you are probably going to lose a lot of money. It's sort of like set-over-set-- it's hard to get away from this sort of a hand because there are so few hands that are likely to beat you.

So I wouldn't worry too much about the result. When you have 9's, the villain has aces, and the flop is dry, low cards, it's a bad situation to be in.