No worries and thank you very much! :)
(Just to answer the formula Q and for anyone else wondering about this!)
It assumes the monster first strike in order to ensure the AD attribute is relevant if the monster has no other significant attributes - in practice if a monster has 10 attack, but 1 BP and 0 DD, and we assume the heroes kill it on sight, the tool can't give a fair measurement of that monster. It works against the purpose of the tool to discount it entirely when it's not a guarantee that it'll die upon being encountered.
That's a logical extreme, but the actual formula used would provide the same bell curves if we took away the first strike -- it is left in to make sure the cases like the above can be correctly mathematically accounted for, especially when said monster is encountered in a group.
The numbers mean nothing on their own though -- it is with comparison and frame of reference that any of it will start to make sense for the quest designer.
Also, apologies for not catching this sooner, but I looked again at your 8 goblin / 1 abomination scenario and I assumed that was meant to be compared singularly...but the numbers you have aren't what the calculator should be returning at all.
8 goblins singularly would give a quest difficulty of 32 while the abomination has 24. 8 goblins together in a room have a difficulty of 144. Sounds like there is a calculation bug I may have missed, and if you could reproduce it and show where it's coming up with that, I'd appreciate it!














