Is there a reason we won't nerf Fizz's cooldowns?

I did the math and basically with 40% CDR and Max E it's 5.8 second cooldown. Max E is 8 second cooldown. But it's start is pretty bad luckily Fizz doesn't really need to use it early, but he can spam the shit out of it mid to late game where the team fights are. Is it just me or does anybody else feel like that's a short cooldown for being untargetable.

His other juker/free escape Q is a 3.6 Second cooldown Maxed with 40% CDR. 6 Seconds with maxed. This isn't to much of a problem, but it just synergizes so well with his E (that is nearly always up) that it makes it that much more annoying.

Now I know most Fizz players don't try to get 40% CDR, but they will have at least some running under their belt because of his low cooldowns. I think the Fizz E should be nerfed to 15/14/13/12/11 from 16/14/12/10/8

Just my opinion. Throwing it out there.