Brett,
Lordmerhen is right, I would move the step back to between the CG and 1/2" behind. The reason for this is that when you get up in on the step, you want the incidence to match the bottom of the float in front of it, not a line between the two heights. Check out the Seaplane forum and they have a few threads on this one.

Good Luck and I hope it is not too much of a problem.
Curtis
P.S. Did you check incidence from wing chord and the top of the floats?