Don't cut off any branches that far into flowering. You really shouldn't do any pruning past the end of week 2. You could end up stressing your plant and stunting growth. A good rule of thumb I use when pruning is to never prune more than 1/3 of your plant off in one session to avoid stress and stunting. I'm not sure if CFL's for side lighting would help. I've only grown with 600 and 1K watts before. It definitely wouldn't hurt anything though. Adding Bontanicare Sweet or Advanced Nutrients Carbo Load will add some bulk to your plants.