I'd lead turn, you already got a bet out of Player5's air range and you're going to miss a bet from Player4 a lot by checking.

PRE
he isos just 4bb, and the fish is coming a long almost always=>le flat
FLOP
The guy is pretty nitty, I expected the K to hit his range a lot, and even if he didn't hit this is like a super good board to cbet even 3way

TURN
I check and expect him to keep value betting K+. It sucks that the fish acts before him as he doesn't have a chance to bet IP, the reg will give up with all his air and it will get checked through a decent amount.

Still, donking seems really weird, would you consider it?

RIVER
reg has either air or a weak made hand at this point, I don't expect him to bet it very much at all, fish seems passive => bet

I am not sure about the sizing though, it's 66% but I'm not sure what that accomplishes. Reg is folding 100% of the time anyway, I don't think the fish has many queens at this point at all.

Should I rather bet bigger and target the Kx from the fish (like $7.5-8.5) or just under half pot it to get him to call random pocket pairs and make him more inclined to raise with a six, and as a bonus get a call from the reg some of the time where I think he's folding almost always to standard betsize?

Donking feels weird because you're letting the reg play perfectly on the turn, but it doesn't matter because it's not the reg who's going to give you money here.

The fish doesn't know any better so you can take an obv but max valuetown line to exploit it.

Yeah I like. It's not like a NL25 reg will fold Decent Kang+ anyway when I donk ~$5.5- to set up 66% river shove against the fish.

I need to remember this though, it's so easy in the heat of the battle to just click buttons and autocheck to the PF raiser

Yeah I was gonna say donk turn too (before I saw what edzwoo wrote that is). By checking you will miss value from the fish when the reg gives up, and i think the reg is going to call at least one 2/3-3/4 pot donk bet so you dont miss much value from his strong hands.

Also, the fish can still have a 6 in which case it be horrible if you didnt manage to stack him.

lol Im too slow...

lead on the turn with 2/3 of the pot, than shove that river