$330 live tournament with around 35 runners

From memory blind level was 150/300 with antes (?25 or 50)

Hero is UTG with KQ approx 22K (starting stacks 17K)

Open-raise to 600 (2X)

CO flats with approx 22K
Button flats with approx 18K
BB flats with approx 11K

Flop QT5

BB Checks
Hero continues for 1600 into roughly 2700

Everyone calls

Turn 6

BB checks
With Top Pair/ 2nd kicker and Flush Draw Hero checks, Cutoff checks and Button bets 2500 into 9100 leaving approx 13 to 14K behind

BB Calls, leaving about 5 to 6K behind

Image wise, the BB is a mainly cash game player who I haven't played against much. From discussion with others the impression I have gained is of someone who is fairly tight but not very creative

This is first time playiing against Cutoff and Button.

Read on Cutoff is that he is prepared to bluff from OOP if people show weakness. He double barelled from BB on turn and river after flop went check-check. Turned out to have Q high

Button seems to be fairly tight. And seems to be playing fit or fold. I would be surprised if he had nothing after calling flop bet and then continuing on turn after being checked to.

How often should I check-raise shove (roughly 19 to 20K behind) Versus flatting?

In the moment I was thinking of club flush draws, OESD and possible TP / Bluffs for Button. Considered sets to be unlikely on the flop as I would have expected anyone with a set to 3bet the flop as the flop is pretty draw heavy.