I love this. Tried my dancing edge in dynamis, in front of the mob with TA dancing edge did around 600~ behind it did 700-800~, also, standing behind the mob, using sushi isnt even really necesary in dynamis, so i'd say it really does give quite the bit acc.
How would you know the first boost is only 3a cc? Upgrading it gives 3 acc, yes, but the first 3 merits go to obtaining the JT.. not too sure thats the same.
"Abmush. Grants an accuracy bonus to melee and ranged attacks from behind an enemy. Increase accuracy bonus by 3." -> Wouldnt that refer to upgrading it?
Well if SE was lazy (and we all know they are), they probably gave similar incremental effects to all new merits. So if it's anything like how they handled slow II for rdm then it'd probably be 9 total +acc.
Slow I 30% cap Slow II 33% cap Slow II +1 merit 36% cap Slow II +2 merit 39% cap
Sneak Attack alone won't be affected, it's a guaranteed hit. Any multi-hit weaponskills though may increase in damage because each hit has more accuracy when used behind the mob with this Trait.