I'm not positive, but I think supercropping may cause hermies. Atleast with female seeds. Perhaps I supercropped too much, but whenever I've done that, I've gotten some seeds in my bud. Tying them down has, so far, produced non-hermies. I hear feminized seeds are very particular. I recommend 1 or 2 toppings, and/or supercroppings. Then stop. I've had about 4 grows, so not super experienced. Topping 2 times has produced perfect plants for me. Supercropping has produced hermies. Again, with feminized seeds. I hear regular seeds are very stable. I don't have space for doing regular seeds.