%ATT vs Total Damage for NLs

[weapon multiplier * (4 * primary stats + secondary stats) * (Weapon Attack / 100 * (1 + %attack))] * [1+(%boss damage + %total damage)]

claw multiplier: 1.75

Base Damage
513 attack, 15% total damage, 59% boss, 0% att
1.75*(4 * LUK + DEX) * (513 / 100)*(1 + 0.59 + 0.15) = 1.75*(4 * LUK + DEX) * 8.926

21% total damage, 6%att Death sender charm
513 attack, 36% total damage, 59% boss, 6% att
1.75*(4 * LUK + DEX) * (513 / 100 * (1+0.6))*(1 + 0.59 + 0.36) = 1.75*(4 * LUK + DEX) * 10.6

15%att Death Sender charm
513 attack, 15% total damage, 59% boss, 15% att
1.75*(4 * LUK + DEX) * (513 / 100 * (1+0.15))*(1 + 0.59 + 0.15) = 1.75*(4 * LUK + DEX) * 10.265

As of this moment 21% total damage, 6% att is stronger right now, but once you get too much boss damage/total damage, 15% attack will be stronger.