Need some more information to accurately answer the question.
However, if you check Document properties of result PDF; it gives you PDF version e.g. 1.3, Fast web view, page size etc.
Based on that you could track down which "Adobe PDF setting" matches with these settings.
"Adobe PDF Settings" are under Home -> Services -> LC PDF G -> in Admin UI.
If you are using PDFG Admin UI (Create PDF operation)for converting PS -> PDF; it takes one input param called "Adobe PDF Setting". There are predefined setting available as described above, and you could also create a custom setting e.g. changing DPI etc.. and pass it to above operation. Similar for PDFG service interface.