Looking at your allies and talismans, I would try and improve the following

Benji - I would swap out the Health Talismans and power up 3 Explosive to replace. Only his heal is based on Max Hp. Vile is great for damage and the extra Explosive damage plus chance for burns will continue to do damage. You could power up some Energy Talisman but the Shields will do fine. You could also use the Immortality set in place if you are having issues with survivability, though Benji is pretty hearty.

Magus CoTD - Since you have no Destiny set and no blocker I would use the Oracle set in place of the Health/Enduring set. I would still work towards a Destiny set using Trooper badges. The set works well and almost any ally that use them.

Gunner CoTD - I would use Chance and Assassin/Immortal sets here

Golden Pharaoh Dog - while not seen much in the upper ends of PVP as he used to be, he can still offer substantial damage buffering. The current gauntlet rewards are Angel Talismans which would benefit this ally immensely. Invisibility Talismans where helpful for me early on before I had Angels in this regard. Often the dog would remove negative effects and gain Vanish thus protecting itself and still supporting with the passive. I am always partial to Energy in green slots but you can utilize anything here really just to bolster the Health since he is gonna be your main damage mitigation.

All just suggestions and I am sure others could have better input but that's how I would approach it at the moment. Who knows, your next soul might be something even better and the whole scheme will change.

Good Luck