[central_va]

Ok, so the whole huge honking thing is moved to trim. No separate trim tab. So manual inputs are overridden by the trim mechanism and the in flight computer. Probably the manual inputs pulling the nose up were forcing the nose down even further. The opposite of the desired attitude.

[Delta 21]

Yep. That jackscrew in #10 controls and holds the entire horizontal stabilizer while in flight. Its controlled by the computer....doing what its told to do.