Any recommendations for my current Ancient Dragon Lightning Strike build?

[Garzec]

One of my characters is running this build as a "oneshot" build with the following setup:

Weapons: Gravel Stone Seal to boost dragon cult incantations + Jellyfish Shield to boost damage by 20% ( + Bolt Of Gransax for Mobs if needed )

Armor: Black Dumpling Helm to boost damage while suffering from madness, other armor is fashion

Talismans: Godfrey Icon to boost ADLS, Lightning Scorpion Charm for more lightning damage, Flock's Canvas Talisman and Faithful's Canvas Talisman to boost incantations

Mixed Flask: Lightning Shrouding Cracked Tear + whatever I need

Attributes: Faith for more damage, Dexterity for more casting speed, Mind for more FP, Vigor for more tankyness and Endurance for fast roll

Spells: ADLS + Golden Vow + Howl Of Shabriri + whatever I need

Playstyle: My casting order is mixed flask -> golden vow -> howl of shabriri > FP flask > jellyfish shield > ADLS

I would like to minmax this build, do you have any recommendations for this setup to improve it?

With the new DLC we get some new items like Priestess Heart to boost dragon cult incantations by 20% but this removes the armor so no madness buffs anymore. So I could remove the armor and howl of shabriri and use this item instead. Since I will start with full health now I could replace Faithfull's Canvas Talisman ( 4% incantations buff ) with Ritual Sword Talisman ( 10% more damage at full health ) but also have to replace the Jellyfish Shield with a second Gravel Stone seal maybe?

What are your thoughts on this ( or what are you running currently )?