$11 two KK hands, on A high flop

[mnlgrind]

Full Tilt Poker
No Limit Holdem Tournament
Blinds: t100/t200
5 players
Converter

Stack sizes:
UTG: t2860
CO: t4285
Button: t2450
SB: t1260
Hero: t2645

Pre-flop: (5 players) Hero is BB with K[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/club.gif[/img]
UTG folds, <font color="#cc0000">CO raises to t400</font>, 2 folds, <font color="#cc0000">Hero raises to t800</font>, CO calls t400 <font color="aaaaaa">(pot was t1100)</font>.

Flop: 7[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/heart.gif[/img] (t1700, 2 players)
Hero checks, CO checks.

Turn: T[img]/images/graemlins/diamond.gif[/img] (t1700, 2 players)
Hero checks, CO checks.

River: 2[img]/images/graemlins/heart.gif[/img] (t1700, 2 players)
<font color="#cc0000">Hero bets t600</font>, CO calls t600 <font color="aaaaaa">(pot was t2300)</font>.

Results:
Final pot: t2900

h2

Full Tilt Poker
No Limit Holdem Tournament
Blinds: t100/t200
5 players
Converter

Stack sizes:
UTG: t1590
CO: t2330
Hero: t2075
SB: t4725
BB: t2780

Pre-flop: (5 players) Hero is Button with K[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/spade.gif[/img]
UTG folds, <font color="#cc0000">CO raises to t400</font>, <font color="#cc0000">Hero raises to t800</font>, 2 folds, CO calls t400 <font color="aaaaaa">(pot was t1500)</font>.

Flop: 4[img]/images/graemlins/club.gif[/img] 6[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/diamond.gif[/img] (t1900, 2 players)
CO checks, Hero checks.

Turn: 4[img]/images/graemlins/spade.gif[/img] (t1900, 2 players)
CO checks, Hero checks.

River: 5[img]/images/graemlins/club.gif[/img] (t1900, 2 players)
CO checks, Hero checks.

Results:
Final pot: t1900


should i have just pushed pre-flop? thoughts?