My dual wielding NPC is nearly working perfectly, only problem is this NPC will not cast spells no matter what. I even made a custom combat style. (Combat style is listed under miscellaneous). I even gave this NPC a 10.00 Magic mult with a 8.30 melee mult, but still no spells are being cast. Does something about dual wielding for NPCs make them unable to cast spells? I have a very similar NPC who uses a bow instead of dual wield nearly identical, yet this NPC functions fine. Which is why I suspect dual wield causes casting problems.

I'd be very thankful if anyone here knows of a solution to this dilemma.

Go to your magic effect and check 'script effect AI data'. I'm pretty sure that tells the npc how many times they can use the spell and at what rate. Read up on the CK, it should be in greater detail.