Skinny to Strong

I have so far been training for strength without giving any though to the muscle mass. My aim was to do 3x5 benchpress, rows with 1x my body weight, squat with 1.5x and deadlift with 2x. I have reached all my goals except for deadlift goal. So now that I have enough strength I want to switch my training to build muscle mass. Another reason is because I am getting bored with the strength training and my central nervous system seems to be getting taxed heavily for too long. Switching to muscle mass training means nothing more than reducing the weights to 80% instead of 90 to 95% and then doing 8 to 10 reps instead of 3 to 6 reps. I am not going to completely switch to muscle mass training. I plan to do strength training one week and muscle mass training the next week. Here is my plan Week 1: 3 x 8 with 80% 1RM Week 2: 6 x 4 with 90% 1RM Week 3: 3 x 9 with 80% 1RM Week 4: 7 x 4 with 90% 1RM Week 5: 3 x 10 with 80% 1RM Week 6: 8 x 4 with 90% 1RM At the end of the 6 weeks and ass...