If you want to make adjustments to your plant to maximize yield, you have to do them when its in the grow stage. You can do things like supercropping or scrog to get increased results. The idea is, that in veg, you try to grow your plant horizontally rather than vertically... so that when you enter flower you have your light accessing much more bud sights. However, once your flowering, its best to leave them alone. At this time you could try to do some low stress training... tying down the stalks of your plants. That makes them more bushy... allowing light to better access parts. But now that you are in bloom, if you snap while trying, your kinda screwed. Time to do everything is when your in grow.