New to floats..what is "step of the float"?
It looks like you will have to move your floats foreward. The setup should have the step, on the bottom of the float, at the CG of the plane or up 1/2" behind the CG. This will allow the plane to rotate properly on takeoff. Also you should have a couple inches of float ahead of the prop to prevent the nose of the floats from digging in. After mounting in this way, recheck your balance and add weights if necessary. Mr. Jim Casey has a web site for the Florida Float Fliers that contains a lot of info that you should know. Check other threads in this forum on the same subject and you will find his name and the web site........Seaplane