Because you mention that the MIDI Map column in Score Manager doesn't display the VDL options, then I'd say that is where you'd need to look. If you upgraded Finale versions then copy/paste the XML (Percussion MIDI Maps) from the previous version to the new version. Just moving them will give you the same problem but with that older version of Finale.
Ted Boliske
Mac OS 10.12, 10.14, 10.15, Win7, Win10 VDL2.5.5, Finale 2010-14.5, Finale 25-27 Kontakt 4-6, various other soft synths