This hand tilts me a lot. Isolate fish all day preflop. Postflop, I don't mind the flop raise given the donks bet sizing, but after you're cold called by the reg you're in all sorts of trouble. I probably raise flop harder, this isn't a board you want to be messing around with and you'd rather donk just jam. Prob make it around 12.

Flatting the fishes 3bet on flop seems ok, cause raising will get us owned by the reg a lot. Once reg comes over top, I don't see how we can continue here.

Reg can have tonssss of huge hands here, cold calling the flop raise to keep the fish in. Fold for sure.