Katarina feed back/change ideas??

Katarina is one of my top favorite champions and has been so a very very long time, so I've come up with a kind of "rework" for her that i think would allow her to be more involved in the early game, but less overwhelmingly powerful later, and would feel more like an assassin.

First off i think her damage ratios are fine, (now with her q keeping the constant damage), but her passive feels almost utterly useless for most of the game until things really start rolling. So what i propose is that maybe her passive should be updated. What I was thinking was maybe every six seconds or something one of her spells would get a boost from her passive, for example her Q could maybe do slightly more damage and could stack knives like vel'koz's W, or rumbles E does now. Her W could get a larger and faster movement speed or maybe slow enemies instead. her E could maybe have its duration extended a little bit. And her Ult could have its reduced healing placed on there as well. This would cause players to have to time kat even more, but also allow then to have an easier chance at farming early with multiple Q's. I would love to discuss more about this if you guys are interested. Kat is a champ with so much potential and it makes me sad to see her not get the chance to really shine vs. other champs Thank you for your time and attention!!! :D Any feed back is welcome!!