I kinda did it on purpose to make this a typical "way ahead or way behind situation", as these happen quite regularly.

It's true that villain should be afraid of a flush draw and he makes a mistake by slow playing his set if that is what he has. But we see that a lot in practice don't we? Lots of villains even slowplay overpairs at the micros.

I don't know about betting 60% pot. If we don't give implied odds (if a flush card comes on the river, we are 100% beat here), then 35% pot is enough to price a flush draw. Why would we bet more than that in any case?