WinPE 3.0+ on GSS 2.5.1

Hello - I am in the process of trying to image a new set of hardware, for which there are no Vista (WinPE 2.0) drivers. I cannot make the new hardware connect to the GSS server at boot, to poll for an image. Is there a way to upgrade the version of WinPE that ghost uses? I have seen and tried the article on Symantec Connect about using a custom WinPE 3.1 image with GSS 2.5.1 and it just didn't work. Ghost boots and once that custom WinPE is loaded, or attempts to load, Ghost crashes as if it did not understand what the PE image was. I am sure I am not the only one here in this situation.

Thanks