I don't know what the instruction says, but some of my friends built and
flew Kyosho AT-6 in the past.
I hear Kyosho AT-6 is very difficult to land since it tends to tip-stall in a
low speed. I speculate that the C.G should be in the correct position,
never be too aft the indicated C.G by the instruction. Otherwise it flew
nice, I heard from them.

Tsutomu Mabuchi