I just augmented my Blood Greaves with Blue Magic skill+4 and Skillchain Bonus+2% and I also have a pair of Mederi Brogues with STR+5 and Blue Magic skill+2.
My questions: In theory, would my new Blood Greaves generally beat out the Mederi if I did CDC>Amorphic Spikes? What about that spell and other spells with DEX and/or AGI mods without CA?
They're basically a wash for both base damage and attack for CA Amorphic, so it would come down to whether or not you're gaining a skill tier from the extra two skill.
Well, skillchain bonus would push it slightly ahead even without a skill tier as long as you don't get interrupted I guess. Mederi with CA down unless you're getting that tier.