55 vs non Standard Player

I would go for at least a 55% pot bet on flop and turn. Especially on the flop against so many players you want to protect your hand against draws and then it’s easier to stack of the river as well.

In this particle spot I would still shove the river against him with less than a pot size bet left.

Cheers,
SDK1987

As multi tabling also I understand this one; But to be completely honest and confident in our decision we should always defend&value in such spots heavily; Especially vs. 4 players! I would go for 450-495 (up to %75=507) OTF and OTT vs. 1 remaining player (assuming his range draw heavy) may bet vary between 65 - 75%; Setting up jam OTR;

Great outcome though, safe and sound!

I agree with betting bigger flop. I can see going high as 450-650 honestly in 5way pot in low stakes game.
Would also bet bigger turn.
Overall i would liked see bigger bets all around for turn/river shove.

Note this scenario what might happened and on this wet board happen relatively often. It might be even more important then actual scenario in OP.
With like 450-650 bet on flop and getting 2 callers you can prob just shove turn pretty easy for around 1 pot.
While if you bet 265 and getting 2 callers you have to bet huge overshove to get in by turn. Not sure we even can do it or we have to give opponents chance to get out their draw+pair/good draws if they miss river by bettting non all-in on turn.

Overall:
I don't see reason to not try charge big on this superwet board and try get in money as fast possible while they feel comfortable with their combodraws/good draws.
You have just set on board what have all possible draws in 5way pot, i would not feel that comfortable not fast playing and trying get in as fast possible.