and just a quick question does OOO alter the creatures in the official DLCs to balance the game out?
The first has nothing to do with OOO. And both yes and no to the second. You can access lots of high level armor in Mehrunes Razor that you wouldn't if OOO controlled it - on the other hand some enemies, such as the vampires, are from OOO lists and will be more powerful than otherwise. KotN is also harder with OOO as it shares a dungeon with it, but OOO doesn't affect its unique creatures.