Your build looks nice.
There are also 2 others Acid Guardian builds but with 2 swords that add a ton of damage. However 2 fewer Guardians.
Sentinel concept https://www.grimtools.com/calc/O2G0B35V https://www.grimtools.com/calc/4ZDq0W1N
Dervish: [1.1.6.2] The Dreeg Bros - Maxed out Scion of Dreeg Dervish (c+)
Also Full Radaggan but now only 3 Guardians https://www.grimtools.com/calc/0V0azo1Z
With only +1 Guardian on Barthollem’s Gavel these dual wield Acid Guardians were better I think but now I’m not sure.
And here’s Super Acid Sigil build by @Valinov.
https://www.grimtools.com/calc/b28oQ5LN