I think you're calculating the Spell Absorption/Weakness wrong. You absorb the base magicka it took to cast the spell, not the damage. So even with the Apprentice Stone/Max Absorption, you'd absorb the same amount of magicka.
I think you're calculating the Spell Absorption/Weakness wrong. You absorb the base magicka it took to cast the spell, not the damage. So even with the Apprentice Stone/Max Absorption, you'd absorb the same amount of magicka.