I built the hobbyking eagle 3D (u can do) and put on floats. The float step is 1/4 in forward of recommended cg. Recommended balance is 3 3/4in back from leading edge of wing. To get plane to balance properly I need to add 11oz to front of floats. The other brand u can do 46 originally was also 3 3/4in back but was changed to 5 1/2 to 6in back. If I don't put the added weight to floats it balances within those specs. Any comments or suggestions as I really don't want to have the added weight.