The other guy played very tight. From 225 hands he was 11/2.7/1.3 post-flop aggression

EverestPoker Game #1955811908: Table Berlin-8 - $0.25/$0.50 - No Limit Hold'em - 20:49:30 - 2007/08/18
Seat 1: ploert ($42.75)
Seat 2: Morph444 ($54.70)
Seat 3: kapitza ($62.05)
Seat 4: querreque ($27.83)
Seat 5: HERO ($47.75)
Seat 6: Menghini ($45.87)
Seat 7: boon99 ($19.30)
Seat 8: XMarsX ($45.00)
Seat 9: Poker_Lolo ($11.75)
Seat 10: amartne ($48.50)
boon99 posts the small blind of $0.25
XMarsX posts the big blind of $0.50
The button is in seat #6
*** HOLE CARDS ***
Dealt to HERO[As Ad]
Poker_Lolo folds
amartne folds
ploert raises to $1.25
Morph444 folds
kapitza folds
querreque calls $1.25
HERO raises to $4.00
Menghini calls $4.00
boon99 folds
XMarsX folds
ploert calls $2.75
querreque folds
*** FLOP *** [Kc 7s 4d]
ploert checks
HERO checks
Menghini bets $3.00
ploert folds
Ibanezrg calls $3.00
*** TURN *** [Kc 7s 4d] [4h]
HERO checks
Menghini bets $8.00
HERO folds
Uncalled bet of $8.00 returned to Menghini
*** SHOW DOWN ***
Menghini mucks
*** SUMMARY ***
Board: [Kc 7s 4d 4h ]
Menghini collects $19.00

Him calling my raise made me very suspicious from the off. That's an 8xbb raise and immediately I put him on a range of QQ/KK, perhaps AK or JJ. Aside from the other AA being very unlikely he would have re-raised me. However, you could say he would have re-raised with KK.

Given this I checked the flop when I saw the king. The small bet made me suspicious and I often see this kind of bet being used when a player has the nuts at the time and wants to keep other players in the pot knowintg they have little chance of being out-drawn. I figured if he had AK he would have made a bigger bet and QQ or JJ he would have checked given his low AF. What do you think of my lay-down? I can see how many people would think I should push on the chance he has QQ or AK and was too cautious