Something that came to my mind recently.
Light armor is statistically superior to heavy armor (assuming effective tempering). They both can reach the armor cap, and light armor gives extra stamina regen to boot, through the Wind Walker perk.
I was thinking, what if the maximum damage reduction achievable with light armor was 60% instead of the usual 80%, but heavy armor was still capable of reaching that 80%? I think this would give both armor types different trade-offs, and make heavy armor a more viable choice for warriors.
Think about it, assuming good smithing skill and armor perks, both armors offer the same level of protection, but light armor has an extra advantage in stamina regen. But, if light armor couldn't give more than 60% damage reduction, the situation would be completely different. Light armor would offer better mobility, but heavy armor better protection. This would give players a choice on which they value more.
I personally wouldn't mind this at all.