$10+$1 KK - did I play too weak?

$10 + $1 Sit & Go, Table 1 - 50/100 - No Limit Hold'em -

Seat 1: (1,470)
Seat 2: (5,775)
Seat 3: Irontoof (1,195)
Seat 4: (1,230)
Seat 5: (1,260)
Seat 9: (2,570)

Seat 2 posts the small blind of 50
Irontoof posts the big blind of 100
The button is in seat #1
*** HOLE CARDS ***
Dealt to Irontoof [K[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/heart.gif[/img]]
Seat 4 folds
Seat 5 raises to 350
Seat 9 folds
Seat 1 calls 350
Seat 2 folds
Irontoof raises to 600
Seat 5 raises to 1,260, and is all in
Seat 1 folds
Irontoof calls 595, and is all in

Seat 5 shows [Q[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/heart.gif[/img]]
Irontoof shows [K[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/heart.gif[/img]]

Ok so I lost, he hit his Ace, that's not the point. I'm concerned about my play before the flop.

Seat 5 has clawed his way back from very few chips by playing aggressive poker. I've got him on any pair or Ax from his raise.

My image is of a tight player not playing many hands, the hands I have played I've either picked up the pot without showing, gone to showdown with something or folded early. So that may well be weak/tight not just tight.

Now I'm unsure what to do in this situation. I don't know if I should try and tempt him into the pot and take my chances or if I should just go all-in hoping to take the pot without showing. I've only recently come back to tournaments from cash games where I'm sure the correct answer is to get him to commit and take the 70/30 for all the chips.

What is the collective 2+2 board wisdom on this. I'm not bothered about the result of this particular hand, I'm bothered about the play at this point in a sit and go.

Thanks