3/6 6 hand reading vs a TAGish player

[detruncate]

PokerStars 3/6 Hold'em (6 handed) FTR converter on zerodivide.cx

Villain is playing 34/16, though we were 3 or 4 way with at least one very loose LAG earlier so this might be misleading. Hasn't been very aggressive post flop, but there are a couple LAGs at the table and this could easily be a result of dealing with a lot of whiffed overs and marginal hands -- WTSD is ~40%, Won$ is also 40%. FWIW he's shortstacked (the default buy in is 10 BB at these tables).

UTG is tightish and seems passive pf (32/5 so far). He's able to fold post flop.

I'm under 20% VPIP and down 10-15 bets at this point I think -- getting low offsuit trash with impressive regularity. If I've been erring re. showdown % it's probably too many rather than too few, though I think they were at least semi-reasonable HU vs very loose opponents.

Preflop: Hero is MP with XX.
UTG calls, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">CO 3-bets</font>, <font color="#666666">3 folds</font>, UTG calls, Hero calls.

Flop: (10.33 SB) 7[img]/images/graemlins/club.gif[/img], 2[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">CO raises</font>, UTG folds, Hero calls.

Turn: (7.16 BB) 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">CO bets</font>, Hero calls.

River: (9.16 BB) 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">CO bets $4 (All-In)</font>, Hero calls.

Final Pot: 10.50 BB


I don't think I'm doing a good job of interpreting the actions of my opponents. What do we put CO on? What hands would make sense for us to play this way?