Is there any mod out currently that weakens enemies health, yet makes their attacks stronger? If I turn the game up to Master the enemies take an unrealistic amount of hits before they die, but my health is realistic. Essentially I'm looking for a way to make the enemy health levels like Novice, while keeping my health level at Master.

Not that I know of, really. However, based on what you request, it seems like that would sort of be the same as simply playing the game as it is. Let's think about this.

Difficulty only changes damage the player deals to enemies and the damage taken by player from enemies, and it does this by using a multiple (see the http://www.uesp.net/wiki/Skyrim:Combat#Difficulty_Level) not by changing health levels.

At the game's normal (Adept) settings with the player and enemies both dealing 100 damage somehow (and everything else being equal, of course, with no extra boosts from perks, magic, poison, etc.), Novice difficulty would have the player dealing 200 damage and taking only 50 damage from enemies, while Master would have the player dealing 50 damage and taking 200 damage from enemies.

If the player and the enemies have 200 health each (and using the above damage dealt examples), the game's normal (Adept) difficulty would have both the player and enemies taking two hits to kill each other. Novice would require the player to hit enemies once and the enemies to hit the player four times. Master would require the player to hit the enemies four times and the enemies to hit the player only once.

What you are asking for would be equivalent to playing on normal (Adept) difficulty but taking only one hit to kill enemies (rather than two as is normal) while the same enemies take four hits to kill you (rather than the normal two, again). That's the equivalent change in health you are asking for, but the game already does this via the damage taken and dealt by you rather than changing the health levels. Specifically, what you are asking for is the same as playing on Novice difficulty (i.e., for enemies with 200 health and each of you dealing 100 damage with no other modifiers, you will kill them in one hit and they will take four hits to kill you).

This is probably why there are no mods such as you are asking. The math indicates that this is already how Novice operates even if it seems different within the context of the game. Of course, it probably seems different in the game contexts because of many different modifiers that exist. However, the same thing can be said about health boosts, and that may be why Bethesda chose to use damage changes rather than health changes for their difficulties.

Hope that helps. You can always make a mod yourself or do other stuff to make the effect you mention (e.g., you can make enchanted outfits that do a health boost).

Yes you might try playing on Adept or Expert, don't wear any armor or magic resist items (or potions), and put all your level up points into stamina or magicka (no health).