AK flop raise

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Don't raise the flop and check the turn. Either call the flop or bet the turn.

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How can this be better against a calling station?

He's been calling down with king high, bottom pair

The flop raise knocks out drawing hands, allows me to isolate a terrible player.

I'm just confused..

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You have two overcards but you have no backdoor draws and you have a weak opponent betting into you when you showed strength preflop. You also have a player to act behind you who cold-called preflop and you haven't given us a read on him.
Your hand is a weak draw, (and you could be reverse dominated.) Call and see what the turn brings.