Use the SVN version. It's already blacklisted there.
I have been using the SVN version with AutoTurnIn since I downloaded. It will still attack the Eel's.
It's not defending, it will flat out target them and stand there for about 60 seconds throwing spells while the Eel evades. I have done a fresh install of everything and it continues to do it.
I don't see the problem either, the Eel is correctly listed under the Avoid with correct ID and name.