As previous suggested, disabling FFB in windows registry fixed all my aircrafts (L39/Su 25 and 27) FFB trim related problems. ( Saitek + Thrustmaster racing pedals )
[HKEY_CURRENT_USER > System > CurrentControlSet > Control > MediaProperties > PrivateProperties > Joystick > OEM > VID(your-FFB-input-id) > OEMForceFeedback]
In OEMForceFeedback Permissions, deny all. Reboot, windows will detect the selected device without FFB.