For flying off of SNOW, the step location is nowhere near as critical as off water. it would probably work as-is. (if you haven't thrown the aircraft CG off, but sounds like you checked that.)

For flying off water... with the step of those floats is that far behind the CG.. you'd set the plane down in water and watch it dip the prop in the water. (maybe even turn turtle, and use the wing as a floatation device...)

The front of the floats should be noteably forward of the prop hub to fly off water. The profile area of the floats being that much forward is why many light planes need added fin area when equipped with floats.