I flower in a 4x4 room under 1000. Over the years I have concluded that removing lower buds and trash will greatly improve the quality and yield on most plants. As others have said, I remove about the lower 1/3 of the growth from each stem on the lower branches. Sometimes I clean them to the last couple of nodes at the growing tip. When I get to the branches that are hugging the stem more than spreading I'll stop and see how things look after a week or two. The popcorn is usually not ripe when the plant is done, and it doesn't yield shit. Much more productive to drive the energy to where it will do some good. I often remove the lower branches entirely, 2 or 3 nodes worth, as these again are kind of a waste of space and energy, with a paltry amount of under-ripe buds at harvest.
(I just did a Plushberry, Spacedawg, and Jackpot Royale about an hour ago- if I read this first I would have done b4 and after pics.)