PermaZONES author here, just giving some thoughts on my own experience and what I know from talking to and working with CrushBoss. I believe CB dropping HLE while using CE was for testing purposes only, in order to find the "right" balance for CE. As he now considers the mod "finished" and is basically done with modding Skyrim, he added HLE back in for his own personal playthroughs. Sort of the same thing with how there's the super hard version of CE because a few people asked for it even though he doesn't recommend it and thinks it's unbalanced. Honestly I've found Animal Tweaks to make a huge difference in terms of difficulty, more so than HLE or CE imo. At least in regards to the main overworld. Bears become absolute beasts that totally wreck you if you can't kill them before they close to within melee distance (which they do very quickly). They will ragdoll you on first hit and be able to maul you again repeatedly before you get up again, even with something like Faster Get Up Stand Up installed. And it is all but impossible to out DPS a troll's regen ability as a melee/archer character without a Fire enchantment until you're around level 25-30. Of course, you don't find many dungeons with these sorts of enemies so like I said it has a bigger effect on traversing the overworld than dungeon crawling where you're meeting more bandits, draugr and vampires. While I use all of HLE, CE, AT, RotE & PermaZONES in my playthroughs (along with Deadly Combat), that's probably overkill for 90%+ of all players and I wouldn't recommend featuring all of them in the pack as standard. I'd like to create a unified balance and compatibility patch for these mods as well as OBIS and SIC, but that's quite the task and I'd rather wait until SIC v7 drops before really tackling the issue so I don't have to start from scratch if/when it finally comes out.