"That's correct. But only Paoka can be resurrected; others simply die without a chance of being revived."
That's exactly what I'm saying: the more damage the Paoka absorb, the fewer losses there will be, because you can revive at least some of them! This is the only way for the Orc to reduce losses, so there's no choice.
"Yes, and also, it's not the Paoka's greatest strength. And the enemy hero's magical abilities."
Their initiative is normal; in a pinch, you can speed them up with a Warlord or hero – you'll still be at an advantage. Well, magic is a real problem for Orcs, what can you do...