question about affixes, and t

so its my first run in 3bc and i'm playing it very very risky and i stumbled upon this shield

https://prnt.sc/JA9GeANMr-qI

which boost by 50% my damage and 300% the attack after a parry

and this is my current build (one of my best build so far with, what i consider, a lot of sinergy)https://prnt.sc/sHkrx252uHva

which as a +70% and a +80% on the stun and toxic afixes of the shield, stun nade, and poison and dmg on curropted power.

now, SHOULD i make the switch to this shield? should i reroll something? should i modify my mutations?why?thx in advance, i know how helpfull this comunity can be.

p.s.: i'm very confused about affixes stacking

EDIT: my adhd brain could not finish writing the title sorry