Primodus, It's hard to really tell from your first pic's the complete setup. Here's a few of how my 40 US was setup. Looking at your pics in the pool the floats don't seem to hold it up out of the water the way mine was. My 60 sets the same way in the water as the 40 did. Both of mine are / (were) setup with Ralph Smith floats.
The way I setup my CG vs. Step was ........... I marked both sides of the fuse in the wing saddle with the wing off. Then I took a stright edge about 1.5' long and set it over both CG marks then drop at plumb bob. (sting line with nut tied to it) down to the floats, I made a mark behind the step at 1/2" back, and "NAILED" scewed them down to the float mounts when the string fell inbetween the step and the 1/2" mark. Am I makeing any sence ???? Well at least thats the way I did it. I'm sure these guys here can help more with EZ'er ways. ( Oh one thing make sure the float tops are level) I screwed that one up and the string was'nt a 90 deg angle down. (boy was I a dumm ***** for that one).

But any how....... To me your floats look shorter then the one's I used and don't look like they keep it a float as much. ??? But Hey what the Hell do I know I'm a rookie still finding my way too.............LOL.

Jump in here guys and throw us a bone, this guy wants to fly this Damm thing...

I do know this, once the bugs are worked out. You'll be hooked on Float Planes !!!!!!!