The reason setmining is not a viable line is Hero has 625 left with 100 to call. With the money in the pot it's razor thin *if Hero autostacks villain every time for the full stack when he hits*. Which he won't of course. Sometimes the flop will come bad, sometimes he'll get outflopped, outdrawn, etc.

As I said folding to the 4 bet would be neutral there but setmining would actually be worse than folding it would be giving away money. I can't believe that a person who is trying to teach another how to play would even suggest setmining here. It's O_O crazy.

Also a 100 raise over a 75 raise is indeed a smallish raise one that could be interpreted as "I have a monster plzzzzz call!" A potsize raise here is I think 240 or so which gives hero 330:165 or 2:1 if I did the math right.