well correct me if im wrong but im sure that attack speed multiplies, it doesn't stack. Also, what youre making seems like a krul build, which tbh is not a good thing for koshka since she is naturally squishy with no forms of getting back up, and when she does WP, wouldn't that make her whole skill set. Likewise, you cant get breaking point stacks TOO QUICKLY, since is 1 attack per second that makes the difference (damage which has no WP whatsoever to boost it). Youre relying on starting a team fight as a squishy warrior.

LAst thing I see strangely is the fact that you maxed your ult, are you sure that will help much if you could use the auto attack resets from your skills to get more breaking point stacks? and that it deals more damage?

Ok great