It's very likely that you pulled (actually pushed
) too much negative G. Remember, negative G-Limit is much lower than positive one. If your elevator trim is off, and you try to keep your nose level, you must counter the lift by pushing the stick forward. Do it too harsh and something bad will happend.
Negative G is a huge AI's exploit. They just push the stick forward and dive away, there's no way you can follow without breaking your own wing. Hope that G-limit will be someday applied for AI too.
Curiously enough, I once tried to find out how much G you must endure during carrier catapult take off (I know it's a mod but it's also quite a good one anyway). Despite the fact that you're accelerated from 0 to 200 kph in matter of seconds, the G-meter (wonderwoman view) always shows 1.