Talking with customer support people on the hotline can be frustrating. For one, they're not farmers or veterinarians, so they often have no understanding of the product outside of the script they're given. Beyond that, legal liability issues are going to prevent them from telling you anything outside of the strict label use. The local company representatives and support people will usually be more candid with you in person, though I've occasionally seen them more preoccupied with making a sale than being strictly honest.
As a veterinarian who has never met you and isn't licensed in your area, I can't tell you to use a product off label. I can say that if I owned a nice herd of red cows in Canada, I'd be putting a Ralgro implant in my steer calves when I handled them at birth.