I have not actually followed SL 5x5, but I would say to stick with it's schedule. Size will come with strength. It will just be secondary to the strength as is the intention of the program. Though, if true bodybuilding is your goal, 5x5 is a great place to start and occasionally go to, but is not where you want to stay in your routines. At least when at the competitive levels anyways. The 5x5 that I have been following is a 4 day a week routine that I don Mon, Tue, Thurs, & Fri. Outside of cardio, core work etc I do not want to add more days. In fact, I spaced out yesterday and mixed my days up which meant that I was working certain muscle groups too close together without enough rest and it became clear as day and the realization of my blunder came when I was doing DB rows. I thought, damn why is this so sore each lift? Oh, yeah..lol