When the rocket tips over at what point will it be unrecoverable? That is using just main engine thrust steering with no thrusters for just steering. Thrust can't go negative and can only go so high. Have you modeled this?
If everything is operating properly, it is only unrecoverable if the cg moves outside the polygon enclosing the centers of the engines, or if the propellant sloshes enough to uncover the feed inlet, starving the engines. Theoretically, it can fly upside down and sideways, as long as it is accelerating enough to keep the propellant going to the engines. However, if it hasn't been able to catch whatever was wrong by the time it gets 20 degree away from the desired position, it probably isn't going to, because the control parameters are probably wrong.
John Carmack
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