Six days a week? You couldn't take enough gear to work out six days a week and still recover properly to grow. You're overtraining. Stop breaking down your workouts into body parts. You're hitting shoulders 4 times a week as well. Maybe not directly but any chest work is going to hit your shoulders, too. Shoulders are easily overtrained and can cause serious problems.
Look into a powerlifting style of training. Three days a week. Check out the 5x5 program.