Mithril armor is garbage. I know very few people who still use it, simply because Steadfast has made other armors so overpowered.
All armor levels should be chopped in half. (Not necessarily 50%, but enough to let someone be able to get Steadfast on all Mithril armor pieces). This allows Mithril to regain it's former glory, and prevent Speed II Scout bricks (yes, it's a thing) from ruling the battlefield.
As this kinda sucks for those who can't reforge just yet, I also propose all players and mobs have double health. (To keep the GUI from getting crowded, the health bar chunks should be divided into quarters instead of halves). This not only keeps people from being able to one-hit you because of armor being nerfed, it also opens the pathway for other kinds of over-time damage.
Thanks for reading! Constructive criticism and kudos welcome!