So you only lost DOUBLE the amount of fat that some say is possible to lose in a week? That's not exactly bad.
Are you taking tape measurements as required by the diet? Pics?
Scale weight isn't that important. You could also be building some muscle on the V-Diet, which is awesome for metabolism and looking firm, but that of course won't show up on the scale. In fact, it'll make it seem like you didn't lose as much fat as you actually did.
Now, you can adjust the diet a little if you feel you need to: drop one scoop of Metabolic Drive for the day and/or a serving of the milled flax seed. That'll lower calories just a little. But don't drop more than that or you'll risk losing muscle.
Fat loss is tricky: sometimes you lose 1 pound one week, then 4 the next. The key is to stick to the plan and only judge results after the full diet.