Impossible to do arbiter of ash with an armor + shield character

As the title say, the movement speed debuff from wearing an armour body armour makes arbiter impossible. More specifficaly, the "multiple explosion with only a circle thats safe" phase


I have the highest movement speed mod on my boots (35%), i stand at the edge of the safe AOE, i move toward the next safe aoe on the milisecond the first one explode and i still can't reach it... because the boss fight is designed for 30%MS or more, mininmum, and my character has 24.2%.

I can run citadels on almost any mods, i can run T16 easly, i can farm trial of chaos lvl 80 easly, my character is not weak, this is not a problem of lack of understanding of game mechanics.

The boss design just gatekeep my character (and the 3 other guys who are unfortunate stupid enough to play melee + armour)

Please Fix