Yes i have even matched the scale with the HeroTTP .fbx file just to make sure orientation and scale were correctly. And yes i have only one root bone.
actually ended up using same model just redoing things.
just seems that it keeps the same bounding box as first scale.
but when animation applied it shrinks it down by perhaps a 100 factor.
it looks as if the animation does not export with its scale.
errors seem to have become less though for some magical reason.
http://i.imgur.com/zNCjKx8.png
http://i.imgur.com/vg1CIkR.png
http://i.imgur.com/YLs70P3.png
http://i.imgur.com/aya1ahp.png