I suppose the fix I would suggest for Arma Arcanum is
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Arma Arcanum
req 5 Shield Skill
Increases your chance to resist harmful status effects from spells by half your block chance
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So essentially it would boost your Bodybuilding / Willpower... but only vs spells. I guess for this purpose I wouldn't consider things like Crushing Blow or Battering Ram to be 'spells'.
Graven Importance, seems alright, although it feels like you've got two talents now which are both intended to solve the same blocking problem. Maybe I'm wrong.
Anyway, I would reword it simply read "Immune to Petrify and Stun. Instead, of these effects, you will be Slowed."
