Thanks for that! I totally agree about raising more preflop, but given that I don't play high limits I was expecting all/most to fold based on how the game had been playing so far. Was thinking I would get a call from the CO and the others would fold, but they all came in.

As for what actually happened: I checked and the tight MP bet just under a quarter of the pot. The CO called and the button folded. I considered folding but the bet sizing surprised me. Given he was playing so tight preflop, I put him on a flush draw with overcards (something like AK-A8) and was betting to block us/for information. I thought I could take the pot, since I wasn't particularly worried about the CO (who had demonstrated he would call with anything)

I shoved and he took a while but eventually called. CO also called.

MP flipped 88 and CO flipped K7.

Turn was a blank, river was 4 for his straight.

If he had bet out at me with a half pot plus bet, I would have folded but what do you think of the shove?