One more thing: Why negator? The meta is currently very fish heavy which means you'll sack lots of permanents and do little to no damage. I'd replace it for something less suicidal.
I have played many Fish variants, several of them using Gators, and I have found that he just doesnt work with so much Fish. Since you use Drains, and you see a lot of Aggro, why not try out Flametongue Kavu?
Where is tinker DSC? You are playing with jewelry and broken blue spells. Going crypt tinker DSC with fow backup happens, andit steals games. Also i couldnt see any brainstorms in your list but still 5 fetch. Why this choice?
I understand that Tinker is basically an "I win" card versus Fish, but after trying to play Tinker/DSC in Aggro for such a long time, I have found that the two dont really mix. With Confidants there is even a chance for being killed by DSC, and that has actually happened to me various times in the past. It may be just me who doesnt agree with Tinker in Fish, probably because I have had such bad experiences with it, even so, I dont recomend it.
I dont see why you are playing only 2 chalice of the voids, either 4 or 0.
Agreed. With Drain mana you can set Chalice at like anything, so it seems right for you to MD four. You have creatures at all CCs so it wouldnt be much of a loss to you, even if it were to be at 2. When I did run Negator in an old deck of mine, I would drop CotV-2 so the Fish player couldnt play almost anything, and Negator at CC-3 could get right by and swing for the win.