post-bubble with nut-straight vs. flush draw

[AtticusFinch]

Just after the bubble, I'm sitting on 25k, opponent has roughly the same. BB is 1k. I raise to 3500 from the SB with AQ and BB calls. Flop comes down KJT, 2 diamonds. (I have no diamonds.)

I check, villain bets 4k, I call.
Turn is a blank. I bet about half the pot and villain folds.

Did I leave some money on the table? Should I check-raise the turn instead, or is the risk of him taking a free card too high after my call on the flop?

[schwza]

i would've bet the flop. that's the kind of flop that's going to hit pretty much anybody.

after a check-call, i like the bet more that i like checking, but i don't like either line that much.