@Tridge,
As recommeded I increased Pitch I > 0.
This produce a critical Lift off with tilt over
During the slow or cautious start Phase the integrator is running high, and comes down according his value.
To show what I mean, the short video and the following Graphs.
The transitions are similar special control cases.
May a reduction of Q_PIT_IMAX help, or do you know a better solution?