Jordan,
The Xy4 print files are either by XyQuest (PCL) or by R.J.Holmgren
(Ghostscript). I have just added A4 paper size modifications and other
miror tweaks. I am perhaps not the best person to provide support for
Xy4 as I do not normally use it.
As to the Xy3+ files, I have added a test sheet for reference purposes:
http://www.lexitec.fi/xywrite/PCL_print_files_for_XY3.zip