PLO100 - Strongly played missed flush/wrap, bluff the river??

[Elrazor]

Hero is running a very nitty 21/4/1.11, playing a 10 seater table only cause there isnt enough 6 seaters open. first time i have played with villan and hes 32/6/3.00 over 114 hand for the session, so he looks fairly run of the mill and ive got him on AAxx fwiw

should i pop the river here? and if so how much??

Cryptologic
Pot Limit Omaha Ring game
Blinds: $0.50/$1
10 players
Converter

Stack sizes:
UTG: $92.45
UTG+1: $50.40
UTG+2: $148.85
MP1: $66.30
MP2: $46.75
MP3: $132.30
Hero: $183.79
Button: $66.50
SB: $39.20
BB: $77.90

Pre-flop: (10 players) Hero is CO with 6[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/club.gif[/img] 3[img]/images/graemlins/club.gif[/img]
2 folds, <font color="#cc0000">UTG+2 raises to $3</font>, 3 folds, Hero calls, 2 folds, BB calls.

Flop: 4[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/club.gif[/img] ($9.5, 3 players)
BB checks, <font color="#cc0000">UTG+2 bets $7</font>, <font color="#cc0000">Hero raises to $14</font>, BB folds, UTG+2 calls.

Turn: 2[img]/images/graemlins/spade.gif[/img] ($37.5, 2 players)
UTG+2 checks, <font color="#cc0000">Hero bets $20</font>, UTG+2 calls.

River: 8[img]/images/graemlins/spade.gif[/img] ($77.5, 2 players)
UTG+2 checks, <font color="#cc0000">Hero???</font>