I am not understanding what you are trying to get at; if there any conclusions you have that I do not, please do share.
But no, while I haven't checked the higher level monsters, the lower levels don't even deal the same damage to me as they did before. Something is most definitely off, and I have every reason to believe that it is the difficulty level.
Actualy base imp and goblin are the only ennemy that never scale up in ng+ its made that way so you can grind the initial levels with ease.
Hence why you should check on a sand witch or a naga