100 PL cap - bluffing made straight

[roggles]

Villain is pretty bad, and has been drawing to really weak draws. Straights on flush boards, Q high flush and other things. I'm fairly sure BB had a set. He thought for a very long time before folding. I am not sure what CO has at all, but by betting I am obviously hoping it is something he might fold. Do you think this $17 bet into a $55 pot will make him fold often enough to be worth it? Note that I can't bet more since it's cap.

Full Tilt Poker
Pot Limit Omaha Ring game
Blinds: $0.50/$1
6 players
Converter

Pre-flop: (6 players) roggles is Button with K[img]/images/graemlins/club.gif[/img] 8[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/spade.gif[/img]
UTG calls, UTG+1 calls, CO calls, roggles calls, SB calls, BB checks.

Flop: A[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/spade.gif[/img] 7[img]/images/graemlins/spade.gif[/img] ($6, 6 players)
SB checks, <font color="#cc0000">BB bets $5</font>, 2 folds, CO calls, roggles calls, SB folds.

Turn: 6[img]/images/graemlins/diamond.gif[/img] ($21, 3 players)
BB checks, CO checks, <font color="#cc0000">roggles bets $17</font>, BB folds, CO calls.

River: J[img]/images/graemlins/heart.gif[/img] ($55, 2 players)
CO checks, <font color="#cc0000">roggles bets $17 ???</font>