What breeders say about their seed's yield doesnt mean anything. Its all nonsense. You could get a gram. You could get ten thousand grams. Depends how long you veg and how big you grow them out. If you are running 1100w, you need the veg them out much larger than that but it looks like you already flipped to 12/12 so to late now. 2 plants under 1100w in soil you should have each plant in about 100l of soil.
This is a 1100w grow after a week of 12/12. 75l pots.