The C of G is quoted on page 4 of the Hype 3D instructions under SETUP. It states 150mm-160mm from the leading edge of the wing. However you can go back to 180mm. I just measured back 80mm on mine and that doesn't come back further than the rear of the D section sheeting of the leading edge of the wing. Mine definetly is at 170mm back from the centre of the wing. It flies great and hovers all day at this.

I spoke with Weston and the boss tells me Model Tech made the first batch. Not sure if that is the same as YT.

When you put your servos in the back end, did you re-enforce the balsa cheeks or just add some hardwood or other.