I like how you ordered them. But in 5e, isn't the dice size irrelevant?
I'm mostly good at making 4e monsters... And "good" to me is that it provided a challenge to my players.
Ask Hanzoku, Sirus, Apiks, Th4DwArfY1, or Mastahcheese about my end-game monsters. Undead Wurm, shadow clones of dead party members, a necromancer who had clones of the party fighting with him, and then a shadow demon that grew to I think 6x6 or 7x7 in size and gained max HP every time he grew. And his daily power killed the party's secondary tank after he was attacked twice with claws (he dropped an action point to use the daily power which the area of effect literally said "target: Everyone", which, if it was outside, had roughly a 1 mile radius.
The party's berserker did 200+ damage to it in one turn and it didn't even take it to half health. This thing had like 700hp (mostly because the party could easily dish out well over 100 damage per turn with at-wills alone).The party was an Avenger, a Vampire, a ranger, a sorcerer, a paladin, a wizard, a spellblade, a warlock and a berserker. Those numbers also didn't account for the vampire or the avenger who joined halfway through the fight and were dead but returned characters. So 100 damage without their help. And instead of making it really hard to hit him, I made him have a stupidly high amount of HP to accommodate for the large damage output. The fact the party had no healer outside of a paladin was terrible for he majority of the game though...