NL100: A7o hits TPLK and the cbet gets check-raised

[Aquadougs]

Villain is 23/8/1,3 (89)

Party Poker, $0.50/$1 NL Hold'em Cash Game, 6 Players
LeggoPoker.com - Hand History Converter

BB: $145.92
UTG: $85.52
MP: $152.97
Hero (CO): $123.61
BTN: $104.55
SB: $112.40

Pre-Flop: A[img]/images/graemlins/spade.gif[/img] 7[img]/images/graemlins/diamond.gif[/img] dealt to Hero (CO)
UTG calls $1, MP folds, <font color="red">Hero raises to $5</font>, 2 folds, BB calls $4, UTG calls $4

Flop: ($15.50) 3[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/spade.gif[/img] (3 Players)
BB checks, UTG checks, <font color="red">Hero bets $11.50</font>, <font color="red">BB raises to $30</font>, 2 folds

Results: $38.50 Pot


Is my line correct?

[Lucky]

this looks fine. Obviously the plan is to go to the flop hu and he'll have missed the flop and fold 2/3 of time. Even when he has underpair, he'll often muck when you miss. The only thing you have to be careful with is when an Ace hits and you're dominated. But in general, this is +EV to punish limpers who'll fold the flop a ton.

[Aquadougs]

Should I've folded this whatever his aggression factor was? If no, about where should the borderline be?

[Dire]

A check raise is rarely going to be an ace here. It's usually going to be a massively polarized range: bluffs or a monster. You need reads to determine if the guy is capable of bluffing flops like this, which more and more people are starting to do.

AF and preflop numbers are close to useless here. Some people bluff these flops habitually. Some never do. Their AF and preflop numbers aren't going to really help you figure it out.

[Aquadougs]

What kicker should I have to continue here? Should I continue with a push with that kicker?