That's good to hear, very encouraging, but just like "the pump", soreness doesn't really mean you'll have better gains (or have any gains at all), nor is it even proof that the SD is enough.
Anyway, whether 1 or 2 weeks SD, it won't matter that much if you start off with the light weights (15RM phase) faithfully. Kinda deloading crap. If you are starting off a little heavier, 2 weeks then (not reallyy entirely 2 weeks, just over a week, but two weeks won't hurt that much if you eat enough).