My problem isn't so much the Ogre having 88 HP. Because hey, you don't know how may HP an Ogre might have. And it looks big and strong.
My problem is fighting a bunch of 2 HP kobolds and two 10 HP kobold shields, the leader has 44HP. Or the 11 HP hobgoblins have a 75 HP leader.
You've already "set a baseline" and sure, a leader will be bigger, tougher, stronger (or older, smarter, fireball) But the jumps between the common enemies and the leaders seem way too unexpectedly high, especially without any real lieutenant-types.