[LE] Tips how to make a proper combat style for follower?

[Revenge096]

I wanted to make a spellsword, so I set that combat style and class in CK, gave him like 20 spells and 1 handed sword and in game he's just using 1 spell(dual casting it actually) and that's it. Even more weird, he's running around enemies for like 20 seconds with this spell equipped and after those 20 seconds he finally decides to cast it, this happens everytime.

So I made a new combat style for him https://www.creationkit.com/index.php?title=Combat_Style
set "ranged" to 0 and meele to 8 and magic to 1.30, yet all this had literally no effect, he's still running around and dual casting that 1 spell.

Does anyone know how to make a more advanced ai? Like which keywords and perks should I include?
For example when there's more than 2 enemies attacking him, he will use that cloak aura spell I gave him.