Good for you!
The first time I was on the beach I lost 50 pounds and hit several plateaus along the way.... It can be very frustrating, but when I stayed OP, I always seemed to have a wooosh after 3 or 4 weeks.
As for the fiber, yeah.... my husband and I both take 2 SF Fiber Choice tablets a day. It definitely helps... I don't know if we'll still need them on Phase II, but for now we do.