99 capped preflop, do you get aggressive somewhere?

[TripleH68]

PokerStars 2/4 Hold'em (8 handed) converter

Button is new to the table, but I want to think he is aggressive given his image(baby with pokerstars knit cap).
BB is aggressive 27/14/1.8 and I put him on a wide range.
UTG has a high WTSD% of 42, with VP$IP = 37 over a short sample.

Preflop: Hero is MP1 with 9[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/diamond.gif[/img].
UTG calls, <font color="#666666">1 fold</font>, Hero calls, <font color="#666666">2 folds</font>, <font color="#CC3333">Button raises</font>, SB calls, <font color="#CC3333">BB 3-bets</font>, UTG calls, Hero calls, <font color="#CC3333">Button caps</font>, SB calls, BB calls, UTG calls, Hero calls.

Flop: (20 SB) 8[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/club.gif[/img], 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, BB checks, UTG checks, Hero checks, <font color="#CC3333">Button bets</font>, SB folds, BB calls, UTG calls, Hero calls.

Turn: (12 BB) 6[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, UTG checks, Hero checks, Button checks.

River: (12 BB) 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, <font color="#CC3333">UTG bets</font>, Hero calls...

Please comment on all streets. Oh and I normally raise 99 preflop, but something here told me to play for set value. I had been raising a lot preflop and was starting to get played back at quite a bit in this game. Looking back at the table being 8 handed I think this was a mistake. Thoughts?