Some other advice: If you keep doing the same exercise in the same order then your body will get used to it and stop growing. You need to change on a regular basis so that your workouts continue to stress your body and you continue to grow. As for biceps, consider doing Hammer Curls as well. My biceps workouts usually include Standing Barbell Curls, Hammer Curls and Concentration Curls. I mix this up with Preacher Curls, Low Cable Curls and Standing Dumbell Curls just to keep the body growing.
Other than that, things to consider for your back exercises: Try changing the number of reps you do. Example: For one month, do 12 reps instead of 8. You'll need a lower weight, but as long as you train with the same intensity it will do you good. After that month, go back to 8 and see how you go.