You can certainly over seed a food plot, but it would it would have to be seeded very heavy, and as expensive as seed is why would you want to spend that kind of money to over do it? When I plant mine, I typically double the recomended amount if I don't plan on dragging it in. If I do drag it in I'll go 1 1/2 times the recomended amount. Everything else you are refering to is an attractent. Pretty much every bioligist I have talked to says you should only use or have on mineral station for every 40 acres.