Load shift moved the aircraft’s center of gravity (CG) aft. Impossible at that point to lower the nose (more accurately, get more wind over the the wings). Stall. Spin. End. I once experienced a full aft track ratcheting of my (pilot) seat upon rotation. Had no forward control authority due to pitch angle/aft CG/gravity preventing moving the seat forward. Airspeed was bleeding off closer to stall. What did I do?