mm43, ok but
the elevator is not at max NU in the "pre stall" it is just oscillating between -2 and -7 deg, there is also much SS with pull and push, but I am not shure if we can decide if the oscillation is caused by the elevator or by the move of the center of lift back and forth with the losing lift or all together with turbulence ...... it is realy not easy to discriminate cause and effect....