What is the appropriate amount of action here?

[BrassMonkey]

Notes on villian:

-Pre-flop raised AKo and checked it all the way down heads up when he missed on a board of [5h 8h 3d Qc] [8c] - strange
-Raised an early position raiser with JQo
-Can be very spewy post-flop - raised K7s pre-flop and capped [7c 2d 8d] board - seen him spew many times
-Called two bets cold from an UTG raiser with freaking TJo

PokerStars 10/20 Hold'em (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is BB with 7[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/club.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">CO raises</font>, <font color="#666666">2 folds</font>, Hero calls.

Flop: (4.50 SB) 8[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/spade.gif[/img], 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">CO bets</font>, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">CO 3-bets</font>, <font color="#CC3333">Hero caps</font>, CO calls.

Turn: (6.25 BB) 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero ?