Hey, this could be the start of a neat little survival-horror mod: "Resident Evil: Skyrim." Slowly, all the NPCs in the game turn to Draugr and attack the player. You step into Breezehome after a hard day fighting wolves and skeevers, toss your helm onto an armchair and call out, "Honey, I'm home!" Aela lumbers out of the bedroom, decaying arms outstetched, growling, "Must...kill...Dovahkiin..."

Hmm, I'm actually not seeing it in the plugin.. I thought it was probably because a dup wasn't getting reinitialized, but that seems fine.
You know - I wonder if it's from re-installing the plugin? And then, after, a formID matched to draugr, but the script was already loaded on the NPC in the saved game? This could require a clean-install/re-install.
That was it, not doing a clean install. With a complicated mod like this, I should've known better

The latest default plugin fixed the non-hostile drauger and guard spawn bugs. The conjure familiar bug is still there (summons extra regular wolves that go hostile on you).
About the size variation thing, I'm not seeing any variations other than spiders (but they already vary in vanilla).
The default spawn rates are still a little too aggressive. In the Markarth dwemer ruin, I was attacked by 12 Falmer (most of them shadowmasters) at once. That was insane and is next to impossible on Master difficulty.
Edit: One other thing I noticed was on some drauger and falmer (after they became corpses), their weapons were not in the inventory and was not dropped. They disappeared somehow.