Empire EFI is basically a modified Chameleon (using PC EFI if I'm not mistaken) and a bunch of kexts. It's designed to work on all systems, but not necessarily well.
So the answer is, no one should be using Empire EFI as a main boot-loader, only to install OS X. I use aserebln's modified Chameleon 2 RC4 (v1.1.9).
Make a other bootable drive and then try eliminating kext one by one from your current kext folder, and if you cant boot, use the other drive to restore the last one