I'd have just shoved this on the flop after their raise, a 50/0 can be raising with all kinds of worse, I'm not folding the turn.

Not keen on shoving the flop against a 50/0 who doesn't likely do any post flop raising without a strong hand. Peeling one with an overpair can't be bad but it's the same old story about paying off passive players being one of the biggest mistakes you can make so I would make a tight fold on the turn.

Even if he has a king high flush draw he's flipping, but passive players don't tend to play draws this aggressively, so it comes down to what worse hands can he overvalue, and there's not many.

Pre: I would be going a touch larger here with your sizing but seems fine.

Flop: I bet flop larger here, in or around 0.50c. We will have the best hand here a ton and should be looking to maximise our value vs villains Jx. A small increase on the flop can have a significant impact on our izes for turn and river. When we get raised here I think I like calling.

Turn: This is a pretty unfortunate spot. VS someone playing this absurd type of stats (as long as it is a meaningful sample) I think I make a reluctant fold. He should not be doing this for value with worse hands and players like this just don't bluff ever. It feels gross laying it down but it seems like it is correct.

Thanks