3rd week of flowering, lower branches are snapping off easily. Too late for a harsh defoliation?

Hello. I like to wait till week 3 to do defoliation, and prune and trim. It will put the plant into shock if you take more than 1/3 of the leaves and branches. But the plant will start growing again in a few days. I like to wait till week 3 because I want the plant to be fully into flowering stage. after it comes out of shock it blooms fully. Leave till week 5 to trim anything you missed. Good Luck. Chuck.