Time to start analyzing SH play (not stats)

[prayformojo]

Ok, this is my third foray into short-handed games, away from the security blanket of full ring. I've played just under 10k hands, and am satisfied that my superficial stats look about right. I've had some swings, but am happy with my win rate for the time being. What I need to do now is start looking into my post-flop play.

Villain in this hand is 21.48% VP$IP, 12.10% PFR, and post-flop aggression 4.00 after 600+ hands. If Villain is observant, and I believe he is, he has seen me bet the flop and turn heads up with unpaired overcards and semi-bluffs.

I'll take criticism on any street, but I'm especially interested in the river play. I find that more and more I am check/calling the river in situations like this. Any thoughts?

Party Poker 3/6 Hold'em (6 max, 5 handed) converter

Preflop: Hero is SB with T[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/heart.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Button raises</font>, Hero calls, <font color="#666666">1 fold</font>.

Flop: (5 SB) 8[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets</font>, <font color="#CC3333">Hero raises</font>, Button calls.

Turn: (4.50 BB) 7[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, Button calls.

River: (6.50 BB) 3[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets</font>, Hero calls.

Final Pot: 8.50 BB