How were you getting the documents to the Fiery? Were you printing from Acrobat? If you are printing from Acrobat Professional then under the...
As you have described the problem, the issue lies at the printers end. If the channels palette in Acrobat shows 100%K then the file is correct....
The engine always prints at 1200dpi, it is just the raster job can be either 600dpi or 1200dpi. Usually 600dpi is the better choice, your...
Enfocus Pitstop Professional (Acrobat plugin) has this option.
The patterns are actually determined by the 'Dither Pattern' setting on the engine itself (found under Additional Functions->System...
Without seeing the resulting files that they are ending up with after their convoluted process to get the file to the RIP it is hard to say, but I...