Final Table Hand for Review

[FatMan]

This was from a $2500 free-roll on Party. This was my first final table in a big MTT. Almost 1900 players. I think I played this hand way too passively. My read on what the SB had was a small PP or two overcards. His bet on the river though got me thinking he had somthing (like he was slowplaying an A) as a it was only 1/3 of the pot and he was trying to get me to bluff back at him.

Party Poker No-Limit Hold'em Tourney, Big Blind is t20000 (7 handed) converter

Button (t92036)
SB (t259919)
BB (t62900)
UTG (t731118)
MP1 (t392723)
MP2 (t118710)
Hero (t180594)

Preflop: Hero is CO with J[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/heart.gif[/img]. SB posts a blind of t20000.
<font color="#666666">4 folds</font>, <font color="#CC3333">Hero raises to t40000</font>, <font color="#666666">1 fold</font>, SB (poster) calls t20000.

Flop: (t80000) A[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets t40000</font>, SB calls t40000.

Turn: (t160000) 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, Hero checks.

River: (t160000) 7[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets t53000</font>, Hero folds.

Final Pot: t213000

I like my raise on the button to try and steal the blinds. My questions are:

1) Should I have bet more on the flop?
2) Should I have fired at it againg on the turn?