After much digging and prodding, I've discovered how to endlessly enchant weapons. This can be done in a few instances, but I would only do it on the Wednesday resets (servers down from 1 PM - 3 PM ET)

Basically, attempt to enchant your weapon about 30 seconds before 2 PM. So 11:59.30. Or as close to the reset as possible. If the enchant is successful, LOG OFF. It will save your weapon. If it is not successful, DO NOT log off, and the server rolls back a minute or two and you still have your weapon.

Have fun! Go get some +15 weapons!

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Lineage 2 Adena.