[UNPLAYABLE BOSS] Vastweld Consistently Breaks Like This (Video example)

Nearly every time i fight this boss, he breaks. The targetable hitbox was always absolutely atrocious, but this is getting worse. Using Hexblast with my curse as an aura, he is almost never cursed. I have to walk in and out of range and hope it takes.

You can see the totems are shooting at his feet, my hexblast rarely connects as i frantically click all over his body even when i do finally get the curse to work, and this time he is elevated above the arena to the point where i can not decipher his telegraphs. The contagion will normally land because it can hit his feet (the target hitbox, for some reason??) I can normally trudge through it but it was so bad this time my frustration was insurmountable and i died.

Please fix this fight, it was one of my favorites but quickly became the one i avoid the most.

1 min clip of my pre-death if links are allowed.

https://www.youtube.com/watch?v=MANWCXZzrhE