I don't like the 3b against a guy that's shown he'll call OOP with a marginal hand and then stack off with it.
I would guess you're thinking now that you've shown how good your 3b range is, they're going to give you lots of credit and fold. But at LLSNL, people often don't make those adjustments. After all, presumably the default assumption would be that you have a tight 3b range until you show you don't -- but V clearly didn't assume that.
To crush LLSNL, determine V's flaws and then assume they're not going to change them. "Adjustment to your opponent" is not exactly the hallmark of LLSNL play. (When you find V's that do adjust, obviously take that into account.)
Don't force bad LLSNL players to exploit you by playing to their strengths. If V calls too much, bluffing him just forces him to take your money from you.
Cbetting into five people, one of whom has showed he can stack off with 2nd pair, is probably just burning money. You made your play preflop, it didn't work. Don't now be the guy that someone else gets to say stacked off with TPNK in a 5-way pot.
As played, V has like 400 back. You're in a sick spot. If you check back turn and he shoves you're getting 2:1. Hard to imagine you're good, but you showed weakness so maybe he is bluffing. If you shove, you might get some calls from a J, but it seems like you're certainly getting called by any TP or better.
V doesn't seem that aggessive, so perhaps checking back the turn and calling the river is viable. V may not shove, allowing us to keep some of our stack even if we're beat. I could also see shoving the turn, hoping to get calls from hands we beat. I'm roughly indifferent between these two choices.
I think it was maybe dgiharris that suggested in one post that, after the session, poster go home and repeatedly kick themselves in the 'nards to remind themselves not to do that again
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Edit: I assume 8s is actually 8c? In any case, that's good. I'm not sure it changes the turn play though. Checking back allows you to see your draw for free and still snap off a bluff or bet with weaker hand) while also vbetting if it comes in and V checks. OTOH, if you shove, you now have more equity when called and maybe there are few more worse hands that can call.