I'm trying to determine the most efficient way to spend phials while using the Charge Blade. I know that circle attacks in axe mode spend one phial each, and that while your shield is charged, triangle + circle in axe mode does a Super Amped Elemental Discharge, which is essentially your ultimate attack and does massive damage.
Does Super Amped Elemental Discharge scale in damage based on the number of phials you have left when you use it? Since it empties out all your phials, I wonder if it's more damage efficient to spend some of the phials on other attacks first, or to just always go for this massive hit as soon as possible.