Buy a better RC heli like the Blade 400. Mine CX2 could probably lift it if I removed all the electrical tape holding it together

. Funny thing I recently tried a 3 cell 800mah lipo for the CX2 and while it is a little bigger it flies great with more power. So try a 3 cell with same mah as your 2 cell and see if that works. No problems so far.