There are several things that could be a problem:
1) Check printer setup in Oracle and set number of lines to 60. We do not use Oracle, but most DB's have a printer setup.
2) Verify that the actual printer is set to 60 lines per page.
3) The other possibility is that there is a form feed in the postscript. This is most likely being put in by the Application. Check the settings (preferences) and see if there is a switch that can be turned off.
4) Assuming that you do not want to twiddle the bits in the PPD file, try to see if the filter has a setting for number of lines per page.