So, something as simple as an airspeed sensor (pitot tube clog) or GPS generated airspeed as redundancy, coupled with a nose up attitude make the computer think the jet is stalling and forces the nose down. I doubt the small trim tab surface can overcome the huge elevator surface. You'd have to have full manual control over the electro-hydraulic control system to pull out. They probably aren't rated to fly inverted even if you were 5,000 feet, so you couldn't roll inverted to give you more time. 3/12/19