Personally, I would add a full set of
Undead Alchemists to the deck as they get nuts in mill. I would probably lose
Frightful Delusion because it's not helping much and
Mindcrank because, well, it's not a good card. I guess they are good if you have out two or more but, in general, you're going to kill your opponent through damage before you kill them with
Mindcrank mill.
I also think you can cut at least 1, if not 2
Increasing Confusions. You don't want to see these until you have plenty of land out and with the flashback you really don't need 8 effects that do the same thing.
Jace's Erasure is also not very good.
There isn't a lot left to pick from in mono-blue, standard mill but a few
Geralf's Mindcrushers could be good. If it were me, I would go U/B, add
Forbidden alchemy, run lots of creature removal and maybe even
Skinrender since it's removal, a zombie and a solid blocker.