Here is the complete process that i made :
I Import the object into Model Converter X
Resizing by 2 the textures :
Predicting and Minimizing the drawcalls :
Saving the textures :
Exporting into FSX MDL object :
Opening Library Creator XML and creating a library :
Opening the MDL object :
:
And ...
I hope that thoses pictures can help you to understand the problem !