Right now heavy armor is severly underpowered compared to light armor. You can get armor capped with plate mail & orcish armor and there is no real point of making any higher level armor except for the looks (and reskinned plate mail with no helmet mod is the best looking thing in the game so all other armors fail in that segment too )
The other problem is that heavy armor tree needs 12 perks for less protection ( light armor has 82% migration, heavy 80% max), inferior combat power ( 50% energy regen > 50% less stagger), so that's 2 wasted perks and 1 inferior perk.

Now instead of nerfing heavy armor in general to make daedric more appealing Dragon plate and Daedric armor should get some kind of buff.

My suggestion is to remake Reflect Blows perk into this: Chance to stagger and reflect melee damage back to attacker while wearing heavy armor in all slots. Chance is based on your armor and is 15% to stagger and reflect 75% damage in fully upgraded daedric armor.

With the modders ageeing that smithing should be capped at 100 and not go over that value, getting huge amount of armor would not be possible and heavy armor would be slightly more powerfull compared to light armor, but balanced since it needs 2 more perks. It would also make daedric armor better then steel plate armor which needs 50 smithing skill.