I have no clue where you got your Reborme's Scheme skill translation from, but:
When HP is 40% or lower, ATK +1.5, DEF +3, weapon's reload speed is up by 35%, SP dmg +20%
Only 20%. And Reborn's doesn't have an exceptionally high Range SP stat. Point I'm trying to put across: Alvatore has really low HP.
KR:l 00 Qan[T] Full Saber l 00 Qan[T] l Zabanya (Final Battle Type) l Harute (Final Battle Type) l 00 Raiser l 00 7 Swords/G l
l 00 Raiser Condenser Type l Exia Repair II l l AGE-2 Normal l AGE-2 Double Bullet l Strike Noir (Twin Linear Guns) l