Are there any simple mods which rebalance the armor aspect of the game? I dislike that there aren't any differences between the two Armor trees in the vanilla game. Both have the same end game damage reduction, just that Light Armor has some better perks and alocation.

Anything out there? Thanks.

Nexus is acting up again for me (big surprise), so I cannot link you the mods, but you can search for them once Nexus is back up.

Since you only want something for light and heavy armor perks, you probably need something modular, so ACE - Combat Skills will probably work (I haven't used it myself) or Skyrim Redone. Be warned that the core module for Skyrim Redone also adds weapons (with perks for each new type) and armor and other stuff. Read the readme before using.

If you want something that touches on absolutely every aspect of the game, save for adding new quests, and removes the cheesiness of vanilla I recommend Requiem. You are REQUIRED to read the readme though, otherwise you will just stand like an oaf in your heavy armor suit watching your stamina drop to 0 and then dropping your weapon and shield too.

EDIT: After skimming over the readme for ACE I think that is exactly what you are looking for - an .esp ONLY for the armor perk trees.