Finally had time to get to my computer....and had some driver issues. Anyway, it's fixed.
To begin, I wouldn't use banks for the non-pitched percussion instrument changes. It makes assigning the percussion midi maps and layouts difficult. Instead, use the Change Instrument function found in the Utilities menu. You will want to have the Score Manager, Device, and Audio Units/VST windows open. This will allow you to assign VDL instruments Kontakt and assign the correct midi maps and layouts. You can find more information about Change Instruments in the Finale Help.
For the Vibes, using a bank works great for mallet changes and switching to other pitched percussion instruments. Just keep track of which instruments are in which slots. To use the patch change Text expressions, with the Text Expressions Tool active, click in the score where you want the change to occur, select VDL Instrument Changes, find your new instrument, click Edit>Playback>Set Value To and in the last box enter the slot number for the new instrument.
Hope this helps. Please let us know if you have more questions or need more clarification.