LOL, if you go any further with your ideas, you'll end up playing LandStill.
As warble stated, Chalice is very strong. I warned you about the wastelands, too.
I haven't thought of the Shackles, but they appear very strong in an aggro dominated tournament.
Why run only 1 Misdirection, when you can run  2 (2 is recommended)? You wouldn't want to waste any more blue cards on 4 FoW + 4 Misdirection.
About the Nevinyiral's Disk: It's waaay to slow.Just think of yourself getting beaten by aggro, you draw a Disk and then you die, because you're not able to activate it the same turn. Keg is the better option. It can be dropped sooner, allowing you to maintain control in the midgame. It's slow too, but significantly better than Disk.
You mustn't loose the Morphlings, as you said, there is no way to win, except the Tinker/DC route, which you can't absoutely rely on.
And not playing Brainstorm because of Chalice is wrong.

Good cards for the oath mirror, except the ones that are stated above, are claws of gix and the most annoying one: summoning station. IMO they are much better than trying to win the wasteland/orchard war.
Pristine Angel is a lot better than morphling, having your mana open to counter and play spells and not using it on morphling's abilities.

hi, dude!
If I were you, I'd definitely play 4cc instead of monoU. It is more versatile. You'll be having a hard time beating FCG and other aggro decks, which will dominate the tournament you'll be attending. There'll be some random combo decks, at least one oath(), a stax and very likely your mirror. The combo player doesn't have any chance against you after you lock him with COTV for 1. The other potential threats you can simply counter. This is why you don't like playing brainstorm, having suddenly 4 dead cards in your deck. But this is wrong! Brainstorm is so much better than impulse, and you are running 5 fetchlands as well.
I think Red is a fine addition to your deck. You get cards like REB, Fire/Ice(to burn those goblin evil pesky "thingies" called Goblin Welder), R'n'R, Lava Dart(to burn them some more) etc.
IMHO the Powder Kegs are too slow.Engineered Explosives are much better when playing some splashed color.
And maybe another thing you should consider: Adding black instead of red. The most played deck will be FCG(according to my dark servants and lackeys), so having Engineered Plague is game winning not only in this matchup, but against oath as well. You would have access to 2 tutors,duress, y.will(very nice after a good drain), etc etc.....
I'm only suggesting, you are the one to make the call! Remember, most decks in the metagame are going to be aggro!
The Kegs are not bad in this case hence they are likely going to sweep the aggro players' board.
Try to add wastelands, believe me, they are necessary.
And to finish with a good players quote(DadoTM):" I wish there was more bounce in the format!"
Remember, bounce is always good. And stick to 4cc!