You need begin play wizard again, then you must know better, what works really and what no.
It works. It all. I personally remove many scarecrows with it in RLoft quests on high reaper. It universal or best spell? No. It used for IK constructs? Yes.
Sure. 20 sec non-saved IK must be balanced, lol.
Yea, i play casters, Necro-Illusionuist PM mostly. 8)
That is why I am of the same opinion as Slarden:
Game balance not spin arouind r10, you know? 8)
Not take DI, second best ED for CC/IK caster? I don't know what caster type play you, but it clearly not what type play mostly player base. Mebbe it's why you have misconception about low DPS output for CC/IK casters, lol.
20% spell CD from both Shadowdancer/DI mandatory to well builded caster, same as 10% bonus to spell cost very good for mana management. Furthermore, you need both DI t2 Epic strike and T3 Inevitable +T3 Daunting Roar for damage and CC! And you inprove your damage much more with T4 Improved Draconic Breath.
Here is such thing ass balance between DC and DD. I pref lose 3 DC from Spellsinger + PA EDs to quadruple (at least, much more really) my damage output from DI any time day or night. 8)
And, of course, you have exactly same crit damage and spell power items as any nuker, lol. You read what i type above carefully? Same Robe/weapon, same ring, +Shield/Orb for more DoT. You pick at least 3-4 more Element than nucers really. Lower amount, better diversity.
You clearly mistake. You need play more in live, not in forum. 8)