Skyspirit 747-8 and PMDG 2D cockpit CG problem

Hello all,

I am new to the forum and I don't know if I am at the right place here but I have a problem:

I tried to merge the 747-8i Skyspirit 2011 model with the pmdg 747-400 panel in a try to let it look more real. Everything works fine, except one thing... I use a payload model of the 747-8 of FSpassengers to fly some routes, but every time I get the error message 'CG not in range' and indeed, the CG has values of about -3 to 10%.

I know this is wrong but I am curious to know if it is possible to solve this with some 'merge tweaks'...

Any help is very much appreciated..!!!

Thomas