>>96028964
>>96028863
As a DM, I tend to consider the stat block presented in the book as a standard representation of that sort of enemy. I will tweak it if I feel I want a slightly more powerful enemy of the same time as a sort of leader of the pack.
And I always increase the hitpoints of things if I have more than 4 players.
I do almost always re-write boss statblocks almost from scratch just because 5e is so fucking terrible at making them interesting.