One other note - I don't add monster mods to attacks or damage. It's irritating that 5e forces accuracy AND damage up. I like being able to vary it, so I used a 4e-style approach where stats don't have a direct, mechanical influence on attack and damage numbers. The influence is more thematic (the strong, clumsy ogre is inaccurate but punishing, the nimble goblin hits all the time for small amounts of damage).