Personally, I start my goslings on mazuri maintenance, and use a garlic press to crush into crumbles until old enough to eat whole pellet. Also, they only get about 25% grain, and primarily feed greens. I start day-olds with chopped romaine lettuce, and quickly switch to grass once they are drinking water well.
Grain heavy diets with high protein are designed to get goslings to full size as soon as possible, without any concerns for bone density, muscle development and angelwing. I want the opposite for my birds.