maybe shingen too if you feel like getting a 2nd soul weapon for light...
shingen's increased PF should do a lot.
abi 1 - AoE damage with a chance to apply blind
abi 2 - self buff to increase light element atk and dark resist
abi 3 - single target damage and chance to debuff light resist (always use this first when debuffing. 2nd if using anything that reduces affliction resistance). this ability also does a ton more damage against dark enemies.
resistance changes towards an element affects affliction rate so be sure to make use of those since it's more than just a defense change