How does learning enchants from disenchanting work?

I just disenchanted an item with +50% magicka regen and +12% destruction spells but only ended up learning an enchantment with +10% magicka regen and +5% destruction. The same thing happened for similar items: the enchantment I gained was significantly diminished. How do I get closer to what I had before? Do I have to disenchant more of the same item?

Solution 1:

When you disenchant something, you're not getting a percentage of the enchantment you learned. What you're getting the ability to use that enchantment: in essence, the base enchantment upon which you built better ones.

So it doesn't matter what your skill is when you disenchant an item or how big of a bonus the enchantment on that item has: you'll always wind up with the same base enchantment to start off with.

Instead, what matters is the size of the soul you use, any perks you have, and your enchanting skill when you go to enchant an item: larger souls and more enchanting skill results in better enchantments placed on items.

Solution 2:

I just got level 100 enchanting last night and found that with this specific enchantment (+5% destruction, +10% magicka regen) it only scales up the FIRST skill and not the second. So I got 17% destruction cost but still +10% magicka regen. I think this is a game bug because there are two stats and is really game breaking for me at the moment.