2-25 is fully stacked effect.
Rubiana was a step back in terms of in-game meta .Pre-Rubiana MDPS like Lady or Joshua was all about stacking, getting their max stat not right after the start of battle. Joshua have 2x stacking buff\debuff, Lady need 3x her job skill cast ,etc. Rubiana can even stop bothering about such stuff. Simply click channeling- and you`re good to go. Tho it wasn`t like it was described in dev blog,yeah (Dev.blog about Ruby told that GWM shouldn`t be affecting her channeling at all. It even wasn`t listed in skill description until last update, so yeah,technically we`ve got a bit broken Rubiana...at beginning. Just instead of fixing it was made into feature.).
Kiss Fluke is more like Joshua. His job skill is giving him +1 AR at beginning,and after that every damage he deal to target ( skill\autoattack) give him stacks. At full stacks he`s getting another +1 AR.
That`s not as good interaction as Joshua`s , as bringing many Kiss`s into squad will not make this stacks faster (it`s self-buff, not boss debuff).
But his basic ACC seems to be way better then Ruby\Eileen`s, so probably 30 ACC artifact isn`t even needed. Hoooray-hooray!