RE: Is your WH Edge "snap-prone" ??
Glad you found the problem!! I think everyone was going crazy trying to figure it out. Even better, I'm pleased to see it wasn't a weak servo issue.
Regarding the manual restraint of the servos, if you divide the torque rating of he servos by 16 you come up with the approximate number if pounds that the servo should be able to handle. It also gives you an idea of how much physical force you could place against it to restrain it. It's a plus or minus thing, and I wouldnIt do that very often. It is possible to damage the flight surface, or the servo amplifier, or both.
Good flying.