I run with light armor, Deathbrand to be exact. Does heavy armor make you move slower? is heavy better than light? Need some help. I have my Chillrend leveled up to68 power so I dont die to often but just wondering.

If you pass the AR cap of 567, you'll be fine. Heavy armor does slow you down, but there are perks in the Heavy Armor tree to slow you down.

What do you mean by AR cap

The armour rating cap. No armour can be stronger than 567 in the game, unless you're one of the mod brigade.