The additional unarmed damage from the Scion perkline does not stack with magic weapon or flame weapon.
If this is intentional, might I suggest flame weapon's additional damage be allowed to stack? Elsewise, this section of the perkline is rendered quite redundant at the same level the perk is attained. That additional damage, I think, is the crux of this perk's strength.
Reset perks/backgrounds while out of combat after casting these spells.
Alright, thanks for the tip.