I remember reading that certain buffs stack differently. Like: A+ B vs. A*B
A+B would mean 1.2 + 1.2 = 2.4
"Start with X Light Gauge" should fall into this category, I think Shine Crystals might, not sure about Attack/Defense but I'm pretty sure Skill Activation does NOT
A*B would mean 1.2 * 1.2 = 1.44
I think this is the category Skill Activation falls under.
DMM vet want to correct me, that's fine. The more accurate our info, the better for all us forum dwellers ; )