MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
What software are you using? I use Simplify3D. Maybe try scaling it down to 98%? I must save I have a very, very large head and it fits fine at 99% so I don't think you would have any problem at 98%.