My suggestion is just to not do so many sets per bodypart. If you want to train only one body part per day, that means you will have shorter workouts. Or you could combine bodyparts for slightly longer workouts and go to the gym fewer days. I'm currently following a very abbreviated workout plan: 4 exercises per day, 2-3 sets per exercise, with a push/pull/legs split. It's short, intense, and I'm making consistent gains. What more could you want?