Fizz's New Kit

Being a Fizz main I found it very fun to try and find what would work best on the new fizz and so far it has been such. There is a bit of an issue however with the way his kit is structured that I've found. As an assassin he is perfectly fine and is in-line with how assassins need windows but there's a better way of playing him. His kit seems to reward fighter or tank fizz more so than assassin. The fact that his W is a huge chunk of his damage and is a long CD means you are rewarded for staying alive longer. Generally this is a good thing that keeps players from throwing themselves into death over and over but when you are so tanky that you can dive and W multiple times it doesn't matter. After all of that work to keep tank fizz from being so dominant he just jumps straight back into the scene so easily. I feel as though his W is just way too much of a main focus in his kit than it should be but I could be wrong and just tunneling into this too much. Anyone else have some insight as to how fizz is now or the optimal build(s)?

TL;DR - Tank Fizz is back