Well... I doubt that all of us are using the same install, with the same patch, with the same set up.
"The CGPosition= data under [AircraftData] in data.ini relates the cg position relative to the pivot axis position of the 3d model, and this shouldn't directly affect the flight model.
The only place CGPosition= affect flight is when determining moment due to force (say from gunfire, bomb release, etc)"
and I think it's true.
And think that the engine dry weight value is 1645lb (746kg) ...do you think the tail weight has the same value?
Original FM gives the nose : 660kg
Wrench's temporary fix : 500kg
And the nose is engine + propeller screw + nose + oil (at least)