Hey, when you start seeing pistils and flowers opening up, you can lollipop and defoliate the top. About the lower 1/4 to 1/3 of the plant, cut off the branches that are still hanging at that height and remove the leaves. The big leaves at the top block sunlight from the remaining flowers. I would definitely do it, including lollipopping. But wait until the flowering stretch is over, otherwise you'll lose the momentum; once the buds start forming, it's definitely over, but then you're cutting off half the buds. So it's better to do it earlier, with multiple pistils you can cut back well, around 2-3 weeks into flowering.