just increase evil spawn rate by +100% and problem is fixed
This increases EP, however, it could counter Bits, Hack & Swarm... maybe even shamans in a full group... not sure, but it has been mentioned that Shamans are NOT EPs (Note: I could be wrong, been a long time about this, considering Shamans drop Whites like normal mobs whereas EPs don't drop whites.)
I would like that too happen, but EP spawn rate as been increased in past updates as well, not just that... people love Events which have the RNG chance to do just that.