Semibluff on the turn, too aggressive?

[AndrewB]

This was a $10+1 SnG, Blinds (75/150) in Pokerstars.

BB had t4200
SB had t4500
Button had t4800

Preflop: Hero is the BB with A [img]/images/graemlins/heart.gif[/img] 6 [img]/images/graemlins/diamond.gif[/img]
Button folds, SB calls, Hero raises to t450, SB calls.

Flop (t900): K [img]/images/graemlins/spade.gif[/img] 4 [img]/images/graemlins/heart.gif[/img] 9 [img]/images/graemlins/heart.gif[/img]
SB bets t200, Hero raises to t600, SB calls.

Turn (t2100): 2 [img]/images/graemlins/heart.gif[/img]
SB bets 300, Hero raises all-in t3100, SB calls.

River (t8400): T [img]/images/graemlins/club.gif[/img]

Final Pot: t8400

Results in white below
<font color="white">
Hero has Ace high
SB has K [img]/images/graemlins/diamond.gif[/img] 4 [img]/images/graemlins/club.gif[/img] (2 pair)
Outcome: SB wins t8400 </font>

Does anyone like SBs call? I had been playing very tightly, only showing down the best hand. SB was obviously showing some strength, but I sensed some weakness and made my semibluff move.

Did my betting pattern give any clues? I was trying to represent a set with the flop raise, or even a flush semibluff.