Let's here some good suggestions people! Here are some of my ideas:
1. At rank 3 Resolve should give you 1% mitigation from damage from all sources per piece of heavy armor.
2. Juggernaut should also give you resistance to critical hits.
3. Double the magicka and stamina you get back from Constitution and reduce the cooldown to every 2 seconds. Heavy armor gives no cost reduction; this is completely reasonable.
4. Juggernaut should also reduce the cost of break free by 3% per piece of heavy armor equipped in order to mirror medium armor's dodge roll cost reduction.
Those are my ideas, what are yours?