Was I right to slowdown?

[Big Folder]

new to this table but everyone seems loose, lots of callers normally and you'll see how many bets cold were called.

CO was showing lots of agressiveness but should i have still three bet on the flop?

Also should i have bet the river thinking CO might have been on a draw?

Party Poker 0.50/1 Hold'em (10 handed)

Preflop: Hero is MP3 with A[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/club.gif[/img].
UTG calls, UTG+1 calls, UTG+2 folds, MP1 calls, MP2 calls, <font color="CC3333">Hero raises</font>, <font color="CC3333">CO 3-bets</font>, Button folds, SB calls, BB folds, UTG calls, UTG+1 calls, MP1 calls, MP2 calls, <font color="CC3333">Hero caps</font>, CO calls, SB calls, UTG calls, UTG+1 calls, MP1 calls, MP2 calls.

Flop: (29 SB) Q[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/spade.gif[/img] <font color="blue">(7 players)</font>
SB checks, UTG checks, UTG+1 checks, MP1 checks, MP2 checks, <font color="CC3333">Hero bets</font>, <font color="CC3333">CO raises</font>, SB calls, UTG folds, UTG+1 calls, MP1 folds, MP2 calls, Hero calls.

Turn: (19.50 BB) 7[img]/images/graemlins/heart.gif[/img] <font color="blue">(5 players)</font>
SB checks, UTG+1 checks, MP2 checks, Hero checks, <font color="CC3333">CO bets</font>, SB calls, UTG+1 calls, MP2 calls, Hero calls.

River: (24.50 BB) 6[img]/images/graemlins/club.gif[/img] <font color="blue">(5 players)</font>
SB checks, UTG+1 checks, MP2 checks, Hero checks, CO checks.

Final Pot: 24.50 BB

[Nottom]

You slowed down way to fast here, 3-bet the the flop and be prepared to bet the turn if capped.