I just started to go real heavy on all my exercises, most people and books feel an ectomorph only will respond to that. Anyway my past two Arm workouts, 3 sets each, 4-5 exercises, doesn't get me sore at all. I'm so pissed because I'm going heavy but, not feeling sore the day after. Start off with 8 reps, then 6-8, then 4-6 on almost everything. Can I increase the amounts of sets per exercise to 4 without sacrificing size?