Riot if you want Kai sa to be weak early and scale, thats fine.
But then her base range needs to also scale somehow.
Make it so she gains 25 aa range for every ability upgrade? So late game she can get 550 or up to 575 range, would not change her first 20 mins or so.
She just needs way better scaling to warrant her current trash tier early game on every lane/jungle and range late game would help her a lot.