If I had kept the loot code inside every plugin, it wouldn’t make sense — it would only increase the load even more. Please give this plugin a chance: it’s free, and all your loot will be transferred to it automatically. Your existing loot tables will stay exactly the same, and it won’t interfere with any of your other loot-related plugins.
Honestly, I don’t see any downside except installing one additional plugin — and thanks to Loot Manager you’ll be able to easily clone, edit, and create new loot tables in a much more convenient way.