The principle  Memory Repair Protocol  to pause only when the energy available and necessary to achieve at least one repetition  Memory Repair Protocol  insufficient. In th Memory Repair Protocol  case, the pause time allows to recharge the batteries and to add at least one repetition to the series. No need to take breaks at each repetition. It would be a waste of time and therefore counterproductive. Memory Repair Protocol

How to take mass without accumulating (too much) fat?

take fat free muscle.

http://x4up.org/memory-repair-protocol/