The Keypadlinc spec says 417 links. Are all of the 16 links already active in the Keypadlinc valid? That is, are some of them duplicates, or links you do not want? You can delete any duplicate or unwanted links so that EZSrve has an accurate record of links that should be there, then factory reset the Keypadlinc, and do an EZSrve Device Synchronize to have EZSrve restore the links it has a record of. That should leave you with a clean link database in the Keypadlinc, containing only the active links desired.
If you have the ability to run the SHN Utility, have it Display the links in the Keypadlinc to get a “second opinion” as to the content of the Keypadlinc link database.