($60) Slowplaying flopped set

Early so no reads. A rough transcript of my thought processes is included in bold.

PokerStars No-Limit Hold'em Tourney, Big Blind is t20 (9 handed) converter

CO (t1610)
Button (t1490)
Hero (t1480)
BB (t1500)
UTG (t1500)
UTG+1 (t1500)
MP1 (t1500)
MP2 (t1420)
MP3 (t1500)

Preflop: Hero is SB with 7[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, UTG+1 calls t20, <font color="#666666">4 folds</font>, Button calls t20, Hero completes, BB checks.

Ok, easy completion for set value.

Flop: (t80) K[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>

&lt;mental cartwheels&gt;
Hero checks, BB checks, <font color="#CC3333">UTG+1 bets t60</font>, Button folds, Hero calls t60, BB calls t60.

Well I rarely slowplay, but this board seems pretty benign. Don't really like the flat call from that guy though, maybe he's on a spade draw

Turn: (t260) 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, BB checks, <font color="#CC3333">UTG+1 bets t80</font>, <font color="#CC3333">Hero raises to t260</font>, BB folds, UTG+1 calls t180.

Hey cool, now I don't have to worry about the spade draw. I'd better start building a pot though, so a raise looks good. I guess UTG+1 has a K so all is well.

River: (t780) K[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>

JESUS [censored] [censored] CHRIST ON A CRACKER HOW [censored] UNLUCKY CAN I [censored] GET? [censored]!!!!!! &lt;mental deep breaths&gt; Okay, maybe he doesn't have the K. Let's see here..


<font color="#CC3333">Hero bets t300</font>, <font color="#CC3333">UTG+1 raises to t1160</font>
Oh [censored].

River play and comments on the rest of the hand?