Finally a cash hand ITT!
IMO folding in that spot is out of the question at 1/2 against the described villains.
Shoving vs flatting is worthy of analysis. I never rule out flatting the flop against draws. Flatting can allow you to react perfectly to the turn card (as opposed to already being all-in when the draw comes in), and it often gives you a chance to induce mistakes by Villain on the turn.
Let’s see. The pot at this point is 85+2(40)+2(130)=425 but say 420 if you’re gonna tip a red-bird.
If you shove to 400 and V1 folds, then V3 has to call a 53% pot bet (270 into 510) to see two cards. So if he has a flush draw or an open-ender (let alone a combo draw), he has to call ainec, and he probably will even if he doesn’t know the math.
Although shoving now gives him a correct call, it’s better than flatting if he’s gonna make a correct fold on a blank turn, because assuming he has a naked open-ender, .68(420+270) - .32(360) is greater than .83⋅420 - .17⋅90. So whether to shove/flat depends on how big of a mistake you’ll be able to induce on a blank turn. The initial turn pot would be $510.
Let b = the bet size you think he’d call on a blank turn.
EV ≈ .68⋅425 + .83(.83-.17)b - .32⋅90
For that to surpass the EV of a flop race, we need b > 171
But in this case it’s not that simple, because you don’t know which draw he has and you won’t always get to play perfectly on the turn. The fact that you’ll have to incorrectly check a lot of turns strengthens the argument for shoving flop.
There are a few other factors, though, all of which support a flat:
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If the turn is a club that gives him a flush or a straight, you’ll have the nut flush redraw (sometimes a boat draw too) and he easily might underbet the turn, allowing you to make a +EV turn call.
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He might have a combo draw. If you knew he had one, flatting would be far superior, but just the possibility of him having one adds to the relative value of flatting.
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He might be trapping with a set, in which case flatting sometimes saves you money (namely when the runout completes the draws you’re putting him on).
Without expanding the EV formula into crazy detail, I conclude that, depending on what you know about V3, shoving and flatting both have merit and it’s likely that neither is much better/worse than the other. If you think he’d snap-call your remaining $270 on a blank turn, I say flat. If he might not even call $200, I say shove flop.