Chesty,
a 737 air tester it is standard to brief the use of power to recover from an out of trim nose low attitude. Especially in a low speed scenario it is one of the first things I would consider (and it works) if my primary pitch control isn't as effective as it should be.
Especially in a low speed scenario are the key words id say.
If the combined forces of stuck down stab and high speed (due to GA thrust),i would think that releaving the forces by reducing thrust would help.
It seems that,getting back to intrim speed as early as possible,using the elevator is quite effective.
If both stab and elevator are jammed then thrust is the only help,,increase thrust nose goes up,reduce thrust nose down...
Wouldnt you say?