Alright - It's a really cool idea, but the numbers don't add up.
I just went to D3up.com and changed my zuni marrow out for an equal in intell tyrael's might, and my inna's pants out for the best rare pants I could find on the AH (150 int 250 vit 600 armor 70 AR 2 OS). Here are the results (unbuffed DPS)
DPS Before: 318k DPS After 298k
DPS Elites: 328k DPS Elites 319k
EHP Before: 480k EHP After 453k
Yes, I a part of that DPS loss is the 9% attack speed off my inna's pants, but frankly I don't have mana issues with COB so lost attack speed IS lost DPS for me
Not to mention lower EHP.
Go Tyrael's if you want to switch it up, or farm Act IV exclusively (or other select areas) but you really have to settle down a bit about this Tyrael's madness :)
do you not have a good SoS?
if not it doesn't work for you anyway.
it's tyr might + SoS that makes this combo work.
tbh i gained all around so i don't see how you lost lol.
and its not just act 4, its more than 50% of act 2, more than 75% of act 3, and all of act 4. only about 25% of act 1 but hey the 14% elite dmg bonus is 100% of this games elites.