Are those Gee Bee floats? See lots of other threads on them! Even if they are set up perfectly they are still difficult to unstick. A few ripples in the water helps them break loose. I have had them in the past and they were always frustrating. The problem stems from the fact that the step is rounded. A sharp cut off seperates the water cleanly and allows planes to take off easily. Also, when in doubt, add more power.