Multiway Drawing Hand -- should I have been more aggressive?

[hockey1]

Bet out on the flop? Cap the flop? Raise the turn? Bet the river? So many questions . . .

Party Poker 15/30 Hold'em (9 handed)

Preflop: Hero is SB with 8[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/club.gif[/img].
<font color="666666">2 folds</font>, MP1 calls, MP2 calls, <font color="666666">1 fold</font>, CO calls, Button calls, Hero completes, BB checks.

Flop: (6 SB) 7[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/diamond.gif[/img] <font color="blue">(6 players)</font>
Hero checks, <font color="CC3333">BB bets</font>, MP1 calls, MP2 folds, CO calls $13 (All-In), Button calls, <font color="CC3333">Hero raises</font>, <font color="CC3333">BB 3-bets</font>, MP1 calls, Button folds, Hero calls.

Turn: (8.43 BB) Q[img]/images/graemlins/spade.gif[/img] <font color="blue">(4 players, 1 all-in)</font>
Hero checks, <font color="CC3333">BB bets</font>, MP1 calls, Hero calls.

River: (11.43 BB) 5[img]/images/graemlins/diamond.gif[/img] <font color="blue">(4 players, 1 all-in)</font>
Hero checks, BB checks, <font color="CC3333">MP1 bets</font>, <font color="CC3333">Hero raises</font>, BB folds, MP1 calls.

Final Pot: 15.43 BB
<font color="green">Main Pot: 5.16 BB, between MP1, CO and Hero.</font> &gt; <font color="white">Pot won by Hero (5.16 BB).</font>
<font color="green">Pot 2: 10.26 BB, between MP1 and Hero.</font> &gt; <font color="white">Pot won by Hero (10.26 BB).</font>

Results in white below: <font color="white">
MP1 has 4h 6h (straight, seven high).
CO has 9s Kd (one pair, nines).
Hero has 8c 6c (straight, nine high).
Outcome: Hero wins 15.43 BB. </font>