You think you're smarter than your plant? The plant produces foliage and roots if you screw with the foliage you will screw up what the plant is trying to do. Did these extreme plants get a double that didn't get trimmed? What are you pruning for more bud sites or to limit the height? When the plant doesn't need the leaves it will drop them. The plant has a survival smaller inner growth that doesn't get light it's there in case something happens to the main growth so it will still be able to produce seeds and survive that can be removed if it gets no light and you don't have marauding goats but leave all the leaves getting light they power up the plant.