Aww you shouldnt feel dissappointed with 4lbs. Thats a fantastic loss. Try carrying around 4lbs for a few minutes let alone all day and see how it feels.
4lbs is nearly two bags of sugar!!!! Thats a LOT!!
I fill up my empty water bottles and the 1.5lt highland spring bottles weigh 3.5lbs I know I wouldn't want to carry that around with me all day!!!
Well done!!!