5/10 draw against a rock

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5/10 NL, 5 handed. The villian in this hand is weak tight and can be moved off some suprisingly strong hands (he sometimes shows his "fantastic laydowns"), but still has a general awareness of the game. For some reason, though, people keep paying him off when he hits.

Villian (~2500) raises to 25 UTG, cutoff and button call, SB folds, I call (~1200) in the BB with A [img]/images/graemlins/heart.gif[/img]T [img]/images/graemlins/heart.gif[/img].

4 players, $105 pot, and the flop is K [img]/images/graemlins/heart.gif[/img]Q [img]/images/graemlins/club.gif[/img]5 [img]/images/graemlins/heart.gif[/img]. I check, villian bets 75, folded to me. I check-raise to 225 and he gives me a slightly suprised look and then calls.

The turn is 8[img]/images/graemlins/diamond.gif[/img] 2 players and $550 in the pot. I?

I was hoping to end it on the flop, but when he called it means he probably has AK (possibly KQ or a set, but the look he gave me feels a lot like he was not happy to see that raise). Is continuing the semi-bluff worth it in this spot? If i bet here and he calls and I hit on the river I can probably get his whole stack, as he would not expect such a strong semi-bluff (I have been playing my draws very weak all night). If I check here, he will see it as meaning I have either a monster or nothing and will check behind. He will also check behind on the river if I check again. If the turn goes check-check and I miss on the river, should I try for a bluff and bet, say, 2/3 of the pot? Or does my turn check give him enough doubt that he will call, hoping I was bluffing? This is one of those hands where I feel that I leak a lot of money since I rarely am comfortable with how they turn out. Thoughts?