Daughter came with me to the float fly early in 2015.
John, to answer your questions, yes the cub has flown on wheels a few times before and the step is just past the CG also the floats are hollow, I was about to just glue some of the ballast strips to the front of one of the floats since I didn't get a response for over a week.
I like John's and BH's recommendations to cut a round hole on top of one of the floats to epoxy the necessary amount of lead inside the float, will a 1/2 inch hole be big/small enough?