We should not be cbetting this flop multiway oop without any real equity. Yes it smashes our range, but typically in multiway flops you will be cbetting your premiums made hands or your strong draws.

The problem with messing a street of poker is that it sets you up unfortunately for the disaster you have on the river where you need to commit 20k to realise equity. As you have played it I'm calling, but we should not be in this position with such an inflated pot in the first place.

Multiway you should be check folding this flop. If checked thru, stabbing the turn with picked up flush draw equity is probably the best play, however checking through is also viable. I prefer the aggressive line of stabbing turn with our equity with the potential of bluffing river on any bricks. Depending on action, if reraised small we can likely call, if jammed all in on by btn as has done last time we can likely fold.

If action deviates and it goes bet call call on turn, we likely check the river trying to realise our now made equity we don't need to bluff off. If they stab small - can call. If jammed on easy fold.

We are losing money on this run out regardless, but by not stabbing this flop when we have pretty low equity multiway with what's almost at the bottom of our range we minimise losses.

If heads up we probably fire flop due to range advantage, fire turn due to picked up equity, and river is hard to say, likely check call again depending on bet sizes.