My Idea for Kha'zix's W.

I know that after the Kha'zix W change a while ago it has been the least favored of all of his evolutions, even with the recent buffs to it's evolved form, it's still not as competitive with his evolved R. Rather, it is more situational, only needing it when wave clear is more necessary, or if the extra utility is deemed necessary. I know some people are probably going to rage at me for saying that and swear by his evolved W, but I'm not trying to make you wrong by using it. What I suggest is, instead of simply increasing the slow and giving his W a reveal, instead add a functionality to it whereas if you are hovering your cursor over an isolated target, you can direct the spikes toward that target, with each additional spike hitting the target having diminished effect(say 30% effect). So it would function similar to Urgot's acid hunter when the target has the corrosive charge debuff on them. If this function was added, the extra slow could be removed from it, since with all three spikes hitting a target(best case scenario, the spikes would still arc inward and can be intercepted), the slow would cap at 48%, nearly what the buffed version is now. The numbers can be adjusted, this is just an idea I've been pondering for a while, giving his W more utility without making it colossally overbalanced(IE when it used to proc unseen threat). Thoughts? Yea? Nay?