Based on reads this is probably (70%) a scared blocking raise and plausibly either a weird value line (10%) or a draw (20%). We want to keep the scared hand in, would like the draw to fold but can play pretty accurately against it, and can probably play accurately against the value line since he doesn't seem likely to make multibarrel bluffs.
V2 is 20% slowplaying a set and 80% on a flush draw.
I'd have to weight the EV given those possibilities between protecting our hand (large pot) and keeping worse hands in both ranges. I lean toward the latter. The plan for the latter is:
- Call $130 more closing action. Pot is $850. About $500 behind.
- On flush turn if V2 in SB checks, check fold to a V1 bet if you're not getting odds to redraw and call if you are. V1 isn't often (<10%) firing into two people on anything you beat.
- On flush turn if SB bets I think you always have odds to redraw.This other villain isn't ever (1%) firing into two people on anything you beat but redraw plus value from V1 makes this a call.
- On blank turn, if SB checks check.
- If V1 bets rather small ($300) just CRAI whether or not SB comes along. People think of bet sizing in absolutes and this is another scared bet.
- If V1 bets enough to put you AI, probably call.
- On blank turn, if SB ($400 behind) makes a non trivial bet just fold.
- If turn checks through shove any non-flush river for value. Probably fold to a SB bet on a flush card. Probably fold to a V1 bet. (He's probably more scared of the flush as you are even though it's not rational, since no one should be checking a flush on the river.)
Overall, your flop SPR was about 6, so stacking off with TP2K in a 3-way pot isn't a huge leak. After your correct flop bet, your SPR is a little over 1. So if you lose a stack to a set, good for them. It's not a flaw in your overall strategy (except against nits who would never stack off w/o a set which isn't your read).
But people are so super-exploitable, in this case by betting small to telegraph fear and by not bluffing on flush boards. You can probably do better than auto stacking off.