Set on str8 boards - slow down or not?

[Akimka]

Party Poker 1/2 Hold'em (6 max, 5 handed)

Preflop: Hero is BB with 9/images/graemlins/club.gif, 9/images/graemlins/heart.gif.
<font color="CC3333">UTG raises</font>, MP folds, Button calls, SB calls, <font color="CC3333">Hero 3-bets</font>, UTG calls, Button calls, SB calls.

Flop: (12 SB) 8/images/graemlins/club.gif, 7/images/graemlins/diamond.gif, 9/images/graemlins/diamond.gif <font color="blue">(4 players)</font>
<font color="CC3333">SB bets</font>, Hero calls, UTG folds, Button calls.

Turn: (7.50 BB) 2/images/graemlins/club.gif <font color="blue">(3 players)</font>
<font color="CC3333">SB bets</font>, <font color="CC3333">Hero raises</font>, Button folds, <font color="CC3333">SB 3-bets</font>, <font color="CC3333">Hero caps</font>, SB calls.

River: (15.50 BB) 6/images/graemlins/club.gif <font color="blue">(2 players)</font>
<font color="CC3333">SB bets</font>, Hero calls.

Final Pot: 17.50 BB

[PokerNoob]

I would shovel chips in on the flop, where you are getting the most set over set value and before another straight card could kill the action. UTG may come along or even raise while drawing to two outs. You could slow down if SB 3-bets the turn as the straight starts to look likely.

[runa]

I second that, play fast on the flop. Without it the turn action it is hard to place and you aren't getting that much value on the flop by overcalls.