Daggerslash (115) has the same data as Daggerslice rk. III (110), only more endurance used Cozen rk.II (114) has 146% agro increaser, Diversion rk.III (109), has 150% : this is a downgrade for more endurance cost.
So grouping rogues get the same damage from their 115 disc as raiders get with their rank 3 disc. So that's not a bug since it is an improvement for grouping rogues going from rank 2 to the 115 disc. You can clearly see that the disc is an upgrade. 110 disc rank 2 1: Increase Chance to Hit by 10000% with Backstab 2: Increase Chance to Critical Hit by 603% with Backstab 3: Increase Backstab Damage Modifier by 411% 4: Increase Backstab Minimum Damage Modifier by 550% 115 disc rank 1 1: Increase Chance to Hit by 10000% with Backstab 2: Increase Chance to Critical Hit by 618% with Backstab 3: Increase Backstab Damage Modifier by 421% 4: Increase Backstab Minimum Damage Modifier by 564%
There are indeed level 110 and lower RK III skills that don’t work on the higher level mobs .... so we have to use the downgrades.