The Hidden Blade/Unseen Strike cooldown issues

I'm playing a hidden blade build and i run into following problem:

increased cooldown recovery rate doesn't benefit you but reduced/less cooldown recovery rate effect you in a negative way.

I think the line "trigger level 20 unseen strike every 0.5 seconds while phasing" is not a cooldown and caps how fast unseen strike can be triggered, but unseen strike additional has a cooldown of 0.5s which can be increased/decreased.
So you can't scale your dmg with cd recover rate but temporal bubbles and the map mod heavly decreases your damage. I think its working as intended but it's dumb.