25 NL KK, A flops

[Kazimyrch]

I have KK, I have raised a lot the last couple of orbits. No specific reads on villain. His flop bet is so small I don't consider folding, but should I have raised in this spot. It seems quite tricky in a 3 man pot. Heads up I would have raised, but here it seemed -EV to me. The turn is an A again. Not a bad card, but villain bets quite large. I decide to fold and villain tells me he had 77. How could I have played this hand better? Somehow I just don't play KK aggressive enough, certainly when an A flops I slow down. Any tips?

Absolute Poker
No Limit Holdem Ring game
Blinds: $0.10/$0.25
6 players
Converter

Stack sizes:
Hero: $23.10
UTG+1: $17.85
CO: $7.75
Button: $9.10
SB: $10.35
BB: $29.16

Pre-flop: (6 players) Hero is UTG with K[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/spade.gif[/img]
<font color="#cc0000">Hero raises to $1</font>, 2 folds, Button calls, SB calls, BB folds.

Flop: 2[img]/images/graemlins/club.gif[/img] 3[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/heart.gif[/img] ($3.25, 3 players)
<font color="#cc0000">SB bets $0.75</font>, Hero calls, Button folds.

Turn: A[img]/images/graemlins/club.gif[/img] ($4.75, 2 players)
<font color="#cc0000">SB bets $4.75</font>, Hero folds.
Uncalled bets: $4.75 returned to SB.

Results:
Final pot: $4.75