Didn't read the whole post, short on time...

I have a alpha trainer ARF with .46 LA and it was very tail heavy, I have put a heavy prop nut and glued with epoxy some weight on the nose. I also moved my battery in the fuel tank compartment, my plane is not even slightly nose heavy (Because I got tired of adding weight) It's actually level, maybe 1 degree tail heavy (Without fuel in the tank) and my plane flies great, to me anyways...

So yeah It's normal I think for that plane to be tail heavy, I think it was designed for the evo .46 engine wich is probably heavier then the la,

I think I slapped a 1 ounce prop nut and 4-5 square lead on the nose.