But you don't need any mod, to add a slot. If you wear the most powerful helms (dragon masks; a less awesome alternative are circlets), you can also wear an enchantable Falmer helmet
Does a bit, but not that much, use of the extra enhanced alchemy enchanted falmer helmet ups the enhance enchantment potion from 32 to 37. The 32 enhanced enchantment potion takes you to a falmer helmet enchanted to enhanced alchemy 29, the 37 enhanced enchantment potion takes your falmer helmet to enhanced alchemy 29, i.e. no improvement whatever. The extra on the enhanced smithing isn't nothing, but it's not that much, and it (obviously, reasonably) doesn't make a difference to the alchemy or enchanting.
The end of what Son? The story? There is no end. There's just the point where the storytellers stop talking.