Hermie is more in the genetics than you stressing it by cutting. I seen on here a guy who would try to stress out a fem. plant to get a hermie and couldn't. If you were to mess with light cycles possibly but i have topped a plant 1month into flowering and was fine no hermie, and it was a FEM. seed. You could diminish yield though when 1month in. Veg is more of the time too do it.