Don't forget that the THS at 14 degrees nose up "blanks" the elevators, and since the HS is TRIM, the PITCH is effectively "blanked". When flying with a loaded (unloaded v/v its purpose) tail, PITCH can get "squirrelly" Especially ND. The THS is trimmed ND for aft cg, so 447 was off to a risky start in her climb. Trimming it up, whether auto or manual, is not a good idea. There is a case to be made for her climbing in default with the THS at ND set. This a/c should have been descending, whether computer, or manual. imho. Temps, aft cg, etc.