Until we wait for Captain Sim's solution you may try this :

Open the following file:

...\Microsoft Games\Microsoft Flight Simulator X\SimObjects\Airplanes\CS_B727-100\AIRCRAFT.CFG

find the following line:

elevator_trim_effectiveness = 1.0

change to :

elevator_trim_effectiveness = 0.3

JETPILOT, you'v been very helpfull in this forum. Thank you for all your posts.

Captain Mucura.