Yes, I already found it. I'll test it now. The only thing is, we can only increase the damage by adjusting the initial morale coefficient = 10. It seems to calculate the number of creatures in the stack itself. We can also, of course, change the damage reduction for each new cell.
I'm saying this because if we increase 10 to, say, 30, then +-3 bd will no longer play a decisive role in changing the damage.
Added 8 minutes later
Okay, I tested it a bit - 5 banshees against nearby cyclopses deal 520 damage instead of 112. That's too much, right? ;) ;)
Added 2 minutes later
Yes, but these are banshees without level 7 stats - the damage:ability ratio will be somewhere around 1:2...