I do wash and dry my fabrics before cutting them.
After washing the fabric, the way the grain is, is the way the grain is.
I don't try to fight with it or "straighten" it at that point. (I've tried a few times.) The fabric just goes back to the way it wants to be.
Maybe back in the "olden days" - we all agree that was in the 1800's, right? -
that "straightening" was worth the effort.