Squishy Legionare

For reasons I can't figure out, my legionare just won't mitigate damage. At level 19, with all passive abilities towards improving guard and armor rating, I still get one or two shotted on threatening. Having full guard is useless as it gets wiped out in one ranged or melee attack. Sub boss enemies, such as the chest event knights, wipe out my full gaurd plus half my health with one swing. I've seen friends with similiar builds and inferior equipment solo these enemies and take on whole rooms getting hacked on without ever breaking their guard.

If it helps, my ability loadout is unbowed (upgraded), warcry (upgraded), shield wall (non upgraded), and walking fortress (non upgraded). My equipment loadout is a 25 armor rating shield, a 235 dps ax, master legionare plate, amulate of constitution +2, ring of enhanced warcry, ring of armor penetration, and belt of ranged defense 2%.

So, is my character glitched? Anyone know a way to fix this or can I never tank again? And yes, I realise not getting hit would help, but I feel and have seen legionares take way more punishment than mine can.