RE: So what do you think the problem is...
Hi
I agree with jims last post, move the step should be about 4" back from the le. and the way it may have been sanded may have placed the step further forward than it appears.
The easy solution if the floats arn't very moveable is to build the bottom of the float up to move the step back.
On my first water plane that had been sanded rounded at the step, when i finally worked out what was up i added 2 balsa triangular wedges similar to aileron stock as a sort of extra step and the problem was solved.
Simon