As the title says, the heavy armor is not competetive with medium and stamina sets. I realize they're all for different things. But I believe the passives in heavy armor arent as noticable as medium. For example, the 5 piece requirement for med gives 12% weapon damage, while the heavy 5 pz requiremente only reduces cost of blocking by 20%.
A way we could balance this is to give the heavy a buff in all its defensive passives to make up for that damage boost you're not getting, or even more health. instead of a 1% health bonus per piece, it could be a 2% health bonus per piece. and instead of reducing blocking costs by 20%, it could reduce it by 30%.
Stuff like that.