I realize this is a very old thread, but as it seems pertinent to my recent experiences, I'll post here with my problem, which seems very similar to Guy's. I'm probably an intermediate level RC flier, semi-competent with taildraggers; but float flying is a new experience for me. I've recently added an E-Flite 15e float set to my Pulse XT 15e, and have probably flown it 8-10 times off mostly glassy water conditions. Most--say, 75%--of my takeoffs are smooth and graceful, but every once in a while I get a nasty diversion from a straight takeoff run that sets the adrenaline running and causes me to jam the throttle wide open and horse the thing into the air. I have come to consider that perhaps my setup isn't optimal, and reading through this thread has given me some ideas I'd like to run by the experienced residents here.

The float kit, being intended to snap on to an Apprentice or some such, isn't readily adjustable. While the floats' angle of incidence seems just about right, the step is just about dead aligned with the CG, which I see isn't ideal. As moving the floats aft a half inch or so is going to be challenging, I'm wondering if it makes sense to add some foam filler blocks behind the existing step to effectively move it aft. Has anyone here had any success with such a modification? Am I asking for trouble?

Thanks in advance for any advice.
Rob