Fiery Express with Lightroom

I would like to know what Lightroom settings folks are using to print on Epson P800 roll paper via Fiery Express. I am using the EFI Unidriver to print from Lightroom. The print job went to Fiery Express where after minutes of processing, Fiery Express died. I can directly print from Lightroom to the P800 and am using Fiery Express ONLY to print on roll paper since Epson told me their driver cannot reliably print 96 inch panoramas and a RIP should be used. Any help from those who own a P800, are using Fiery Express, and print from Lightroom will be appreciated.