400 NL, I isolate a donk and hit the flop hard. Extraction?

[SABR42]

Villain is a passive fish preflop (55/6), but makes big bluffs after the flop.

Poker Stars, $2/$4 NL Hold'em Cash Game, 9 Players
LeggoPoker Hand History Converter

UTG+1: $459.25
UTG+2: $509.15
MP1: $234
MP2: $427.50
Hero (CO): $461
BTN: $738.95
SB: $444
BB: $326
UTG: $421.90

Pre-Flop: 7[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/club.gif[/img] dealt to Hero (CO)
UTG folds, UTG+1 calls $4, 3 folds, <font color="red">Hero raises to $20</font>, 3 folds, UTG+1 calls $16

Flop: ($46) J[img]/images/graemlins/spade.gif[/img] 3[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">UTG+1 bets $20</font>, <font color="red">Hero raises to $50</font>, UTG+1 calls $30
<font color="blue"> I think a small "goofball" raise is the best play here. I invite him to come along (hopefully even 3-bet), plus I get more money into the pot. </font>

Turn: ($146) Q[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">UTG+1 bets $80</font>, Hero calls $80
<font color="blue"> I think he's bluffing here a ton, so I don't want to scare him away with a second consecutive raise. </font>

River: ($306) 8[img]/images/graemlins/diamond.gif[/img] (2 Players)
UTG+1 checks, <font color="red">Hero bets $311 and is All-In</font>
<font color="blue"> Well this is obvious... </font>