Currently you're not hitting the def down cap (only 35%), if you want to run with these KH, I'd actually use ambush over sniper for 45%/45% debuffs, or use diana instead of either Michael or Rapha. With SSR Artemis, sniper is all you need to hit def down cap. Light's core will basically be Tsukuyomi and SSR Artemis, most of the time with Sol and then either Raphael/Eros or a burst build with Michael (and Shingen). Situationally, if you just need to get through a tough rage phase, Frey might be a decent substitute (even possibly for Sol for some encounters). Herc's relic weapons will offer additional choices though.