each one consisting of 3 heavy sets (6-8 reps, no more and no less)
What happens if you do 9 reps or 5 reps? Will your leg explode? Will you overtrain to the point of never being able to train again? I'm scared 
6-8 reps has been scientifically proven and peer reviewed to induce both muscle tissue hypertrophy as well as central nervous system weight adaptation. If you are using a weight that is too heavy for you to achieve a minimum of 6 reps then your muscular hypertrophy will suffer. You will make some gains as a result of differential muscle fiber adaptation but the primary action factor in sub 6 rep training will be CNS adaptation. Furthermore, a weight that is light enough that 8 reps may be exceeded will induce hypertrophy to an extent, but will also emphasize muscle tissue endurance. While muscular endurance is highly beneficial for a variety of sports, it serves very little role in bodybuilding (except perhaps capillary expansion). Beyond that, greater than 8 reps will mimimize CNS adaptation which sets off a domino chain of events that will damage hypertrophy; CNS adaptation is the first step in weight progression, weight progression is the most important factor in muscular hypertrophy.
