"They don't then check to see if the CG is still in the correct place. Often it has moved back, the plane is now tail heavy and either won't get off the water because the step is not under the CG, or it gets off the water and flies terribly because it is tail heavy. "[QUOTE]

OK, so basically once I have a plane flying correctly and then add floats, I need to make sure that the plane balances at the original CG WITH the floats installed, making sure the float step is lined up with the CG.

I thought I read in the GP 40 size float kit instructions that when installing floats, the CG should be moved back 1/2 inch from normal land flying. Does this sound right?