CG can't be it... both his and mine snapped just fine, first time out,
then lost the ability to do so. This is with no changes, on mine, at least.
I'm leaning very hard toward weak servos.
I noticed on the fourth time out, when it would still flatspin, that
after I wound it up flat, in another five or six turns, it started coming out.
It didn't do that the first three times out.
By the fifth day of flying, it wouldn't flatspin, nor snap, whatsoever.
Nothing changed at all in my config. Now it won't even enter a "regular" spin.
Whenever I get the extra dough, I'll swap in a couple servos to find out


As for the knife-edge, I think that's just the result of the small fuselage.