10/20, top set 4 ways

I'll address question 4 first. There's really no such thing as a GTO line, or even some approximation, for a hand that goes to the flop 4-ways.

1) If checked to, I'd bet 80-100, and my range will be fairly straightforward/equity driven against 3 opponents, so {AA-77, 33, any 8, open enders, gutshot+BDFD, and overcards with BDFD). Incorporate some slowplays or check/raises with AA/KK, 33, JTs/J9s/T9s/65s, and some overcard + BDFD hands.

2) I think your size was good. If you got 1 caller, you're left with a stack you can shove on turn, or go for small bets on turn & shove river to squeeze out all the value you can.

3) I assume this question means would we play differently knowing how wide these guys' ranges are preflop. Yes. My answer to question 1 would be to bet big when checked to, like 2/3 pot with an even more value centric range.

Welcome to the forum, OP. I removed results from your post, as they bias advice. Please wait at least 24 hours before posting them.

Because of that, your third question will have to wait too, but trust me, people get way too wrapped up in results when they see them in the OP.

I would bet A7+ and some reasonable draws. Not messing around with backdoors 4 ways. Your raise size is fine, I would go to 600 but same thing really. As played call turn of course.

I would choose a raise size that allows us to comfortably jam any turn card. In this case I think opponents will be fairly inelastic to sizing after they lead for more than 2/3p otf into multiple players. Not to mention you have another caller in between, this 500 size just accomplishes so little and gives both your opponents incredible odds to draw and potentially stack you. If we raise to 800-900 we will face a similar continue range and we can comfortably jam any turn. This is a situation where the board might seem relatively dry, but actually there is a lot of urgency for the money to go in now vs on later streets.

As for your questions about theory, I think this is basically irrelevant when you play live poker. A lot of times you could literally tell your opponent exactly what your hole cards are (I've actually done this before), and they will still call you with a worse hand. No reason to try to be balanced when most of your opponents make very little effort to try and exploit you.

Always calling turn.

Flop seems fine, as long as you can get stacks in by the river you're playing fine. If checked to I like to go quarter pot here and all people to call light or hopefully start spazzing and raise you huge. But it depends how passive people are in your game. If they are loose passive you can probably go bigger like half pot. Let me give you an example hand history I had:

9 handed 10/25/50 I open $125 with black 88 first to act, 4 callers including pro in HJ, rec on button, rec in 25 blind. Pro has around 5.3k and I cover.

Flop $685 8d5s4s I bet $150, pro raises to $500, I call, all others fold

Turn (8d5s4s)7c $1,685 x, pro bets 1k, I call

River (8d5s4s7c)7h 3,885, X, pro jams ~3.7k, I call. Pro shows KcQd.

Kind of an extreme example where pro was absolutely spazzing, but with so many draws available and 2 action recs, recs were more the ones I was targeting for a spaz raise.

So you bet 5 ways and he thought this was the spot he’s been waiting for with 2 players behind and no pair no draw on a board you’re rarely gonna bet. Was his name Davo?

The hand looks pretty standard.

You may raise bigger otf, like ~600, but it doesn't make a huge difference, given your SPR.
You might just flat flop if you were closing the action, but with the btn still to act, I think you have to raise.
If flop had checked through to us, I'd have bet ~1/3 pot .

Turn is an obvious call.

Think our flop raise needs to be bigger. At least $750, but maybe $900 or more. No need to hold back with top set on this board, facing this action. Very likely someone has an OESD.

Turn T is gross, if someone has 96, or somehow shows up with TT, but we're never getting away from it. Just get it in.

1) I'm c-betting range here, for 20% to 1/3 pot. I'd only have a checking range if ewas trying to exploit a specific opponent or picked up a tell that made checking a better play than betting.

2) raise bigger, at least 5x, but 6x or more isn't outrageous.

I'll pass on trying to answer the other two questions.

Welcome to the forums!

No one really knows the answer to 1 or 4 in middle position of a 4-way flop. The more confident someone is with their answer, the more you can disregard their opinion. My current running theory is that the smaller you make your flop bet, the more closely your MW betting strat can approximate your HU betting strat. Take that theory for what you will.

I think your half pot raise on the flop is good sizing. We should arguably have no flatting range here and I like a size that lets us include as many hands as possible in our linear range. Maybe we don't care about how we're playing our whole range, but I'm not even sure what the arguments are for going larger at this SPR to begin with. It's gonna be an easy jam on the turn regardless.

#3 obviously isn't possible to answer with results removed, but I don't see how it'd be a practical question even if I knew what their hands happened to be this time.