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An error in devotion tree (maybe wrong link because you have different head component in the screenshot provided)

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If you put Seal of Blades into the shield for more Life Leech then know it doesn’t work for your gun.
Grim Tools doesn’t display it correctly. In-game it’s properly divided into off-hand and shield.
Seal of Might might be better here as your Phys res is not very high. -
in GrimTools your Aether res overcapped is only 18% and could be higher and you’re using Bleeding res augments already having 44% Bleed overcap
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Blast Shield is not only about absorption but bonus to Max Resistances. Blast Shield reduces damage taken by let’s say 15% - 20% (16% of damage taken instead of 20% for example after max res is increased so 4% / 20% = 1/5 = 20% less damage!) if an enemy doesn’t reduce your overcap and not for Physical damage of course for which damage reduction is far less. It really wouldn’t hurt you to pull 1/2 points from Demo mastery and put them into this skill. There’s always a chance someone may take your build into harder content. As for absorption, you said this about Ascension:
Well Blast Shield has more absorption when procced and you don’t have Ascension permanently.
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