Pull the trigger? (100NL)

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Hi guys, this is basically a question about flow/'levelling' etc. I feel like this is an area of my game that could definitely use some work, so I've tried to give an accurate reconstruction of the history and see how you think it should impact on the pre-flop play of a particular hand. The title may be a slight misnomer as there is no bluffing involved but I thought it was kind of apt anyway.

Villain is running at 20/19 over 250 hands. Seems like a decent, aggressive player. He has been sitting just to my left over a couple of tables for quite a while. Early on he 3-bet my lp raises quite a lot, I 4-bet him a couple of times and he folded. Since then he seems to have backed off a bit. An orbit or so ago we played this hand:

PokerStars No-Limit Hold'em, $1.00 BB (6 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

saw flop|<font color="#C00000">saw showdown</font>

MP ($100.45)
CO ($22.95)
Button ($136.15)
SB ($137.85)
BB ($109.90)
Hero ($128.45)

Preflop: Hero is UTG with Q[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">Hero raises to $4</font>, MP calls $4, <font color="#666666">1 fold</font>, Button calls $4, <font color="#666666">2 folds</font>.

Flop: ($13.50) 4[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets $9</font>, MP calls $9, Button folds.

Turn: ($31.50) 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $20</font>, MP calls $20.

River: ($71.50) 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $95.45 (All-In)</font>, MP folds.

Ok now the main hand:

CO is 50/13 type. I have 3-bet villain's utg raise from the blinds once previously, though some time ago.

PokerStars No-Limit Hold'em, $1.00 BB (6 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

saw flop|<font color="#C00000">saw showdown</font>

UTG ($98.50)
MP ($13.45)
CO ($112.35)
Button ($158.70)
SB ($116.40)
Hero ($162.45)

Preflop: Hero is BB with J[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/heart.gif[/img].
<font color="#CC3333">UTG raises to $4</font>, <font color="#666666">1 fold</font>, CO calls $4, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $19</font>, <font color="#CC3333">UTG raises to $47</font>, CO folds, Hero ?