Jayhawkmike
I am with Konica Minolta. From what you describe you have two Fiery IC 308 print controllers running FS100 operating system. If this is correct they need to be updated to the FS150 operating system. The service tech would have to do this. I base this on the following that you stated 4gb of RAM which implies the IC308. The IC 310 ships with 8gb of RAM. The FS100 operating system was on the initial release of the IC 308 controller. (this runs on top of Windows 7) does not support PDF/VT, the FS150 operating system does. You can go to Device Center in Command Workstation, will display what Fiery OS you have.In addition, PDF/VT is best approach since it was designed for variable data PDF. I do have clients using PPML with no issues as well. In addition, is the cache turned on in the Fiery configuration, this helps with RIP perfoormance. Is the Fiery processing the PDF files via classic PS interpretation or via APPE? This may be turned off on your controllers and can be turned on via the Fiery configuration. I would benchmark which works best for your file structures. For your type of environment I have clients that added 4gb of RAM to improve overall performance, it does help. The RAM is standard spec not proprietary. In addition, I have one client, a large mail house processing over 50k records in a file. The RIP still processes it without crashing. Note: The files have been flattened, and no image over 300dpi. To further improve the performance of RIP using the Fiery VDP helps. One file is submitted that is the static form(s) minus the variable data this becomes the master file on the Fiery and is saved to the library. The second file is your variables. The placement of the variables must match the location on the master file. In addition, job properties (page size, simplex/duplex must be the same between master and variable. Once the master has been saved you submit the variable file, select to use the master file from within the VDP option on your print driver. The master is ripped once and stored in RAM. The variable are ripped. Setup takes longer per job although this approach saves on overall RIP time. If you are not familiar with this approach have your local KM personnel assist you. I would review what your current OS is, FS100 or FS150 then proceed accordingly.
I hope this helps some to reduce the overall RIP times.