henra
hey. The three degrees I take to be THS position at trimmed cruise.The PF initially called for climb, but may have become impatient with response in Pitch coupled with his unfamiliarity with cruise/manual flight. If he kept inputting climb whilst awaiting a Pitch up, he could have been commanding the kind of abrupt Pitch up that is suggested by BEA's statement of "The aircraft, at 10 degrees Pitch up, finally began to climb." If, with the eventual rotation of the airframe, the THS and elevators were approaching max Pitch UP deflection, the rapid climb with alarming Vs would be explained. The ND inputs are in there until the second STALLSTALL, we just don't know when in the sequence they occurred. Thus far, so far, so explained.
I still think the PF and PNF thought the a/c to be ND and oversped when commencing the 10fpm descent, hence the continual NU inputs.
If, at 10k feet, the PNF saw the a/c's true orientation, (assiete), his over command may have been a ND to the stops. "You have control".