Stun treshold problem

Hello fellow POE2 enjoyers!

I'm trying another frontliner big boy this season.

Went Warrior Titan with full armor and life. I got boots with stun Treshold, I have The Brass Dome Champion Cuirass and Wailing Wall Effigial Shield. It means I have a lot of stun Treshold and I also have 1/2 chance to block any hits, even the usual unblockable ones... but I simply can't complete the vast majority of my attacks since I get interupted way too often (using Sunder as my main ability, Inferal Cry as my buff and Hammer of the Gods whenever available for rares and bosses).

I have about 15k armor and around 100% stun treshold increased from passives and I feel like whatever I do, it is not enough.

How do you fellow Mace Slammers complete your Sunder and smash the evil that plagues Wraeclast?

It is probably a me problem since I'm not the best player, but I do enjoy tanking and smashing things. I just can't progress as much as last season even if last season I was not able to complete the 4th trial while in this season I probably won't be able to clear 3rd Ascendency as it stands.