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everything where mobs can spawn so it makes it so they can only spawn in your tower for maximum efficiency.
sidenote: you dont really need a mobfarm i've played this pack 2-3 times and not once have i found myself wishing i set one up :P
i'm having this problem as well but i believe its a matter of reputation, since more quests with rep have been added the triggers are likely to have increased
your setup is nicer then mine :P when i breed up i puts 4x4 behind my starting seed and also snake pattern off of that so they still work for me but still is a leave and forget :)
im not sure if 3rd party packs have access to recommended mods or not i cant see why but it seems like i can remember someone saying it earlier in the forums