Have you tried out any Mods changing the way enemies behave like OOO, Frans or FCOM?
I'm not sure, but as they make combat harder they will surely not have forgotten something like that.
If those don't help you'll have to ask somebody who knows scripting to do it.
I'm no good at scripting so I won't be able to do it.
Running FCOM right now. If anything, FCOM overpowers illusion even more because of the increased enemy spawns. You can see some lovely 5v5 fights.
If you wanted every overpowered magic effect nerfed you'd also need to hit weakness to magic, chameleon, fortify attribute, fortify skill, and lots more.
Numerous mods nerf the overpowered uses of chameleon, but I don't know of any that target frenzy / calm / etc. Well, Supreme Magicka does double the level at which they effect all creatures.
It's not that I want it nerfed, it's just that I think there should be a way for enemies to counter it. All of the effects you mentioned could be countered by simply giving spellcasters dispel spells, either to use on themselves or you.