I'm really unsure why people worry so much about someone else hijacking the stack while you're going off. All you have to do is play it right and minimize anything that they would want to hijack. Heck, if you're using Cunning Wish/Twiddle and UB duals you might as well just do the following:

Cunning Wish and Twiddle under the Eye.
Play Duress/Therapy.
Resolve Twiddle untapping a land, resolve Cunning Wish getting back Twiddle, resolve Therapy/Duress. Rinse and repeat.

This would strip thier hand of any instants that might screw you up. Now that I think about it though, you could probably just run a Funeral Charm in the sideboard as a Wish target so that you can force them to discard thier entire hand. Which brings me to the reasons I like this idea so much: 1) Your win can be operated completely out of your sideboard so that metagaming is basically switching out silver bullets. I can't even imagine how mean it would be to go: Twiddle, High Tide, Boomerang off a Cunning Wish. 2) Because its just really damn awesome to be able call a two mana instant that bounces a card a "silver bullet"...Suck it, Upheaval. 3) The deck looks like it just won't die. I mean, resolving a Twiddle basically says, "As long as I have the ability to cast 1cc cantrips or Brainstorms to rip through my deck, I'm going to eventually win." 4) As others have said, it has a very small amount of core combo pieces.

Now that I'm done lauding my praise, there's one suggestion that might help with sacking the Rector: Phyrexian Tower. Granted, its just a colorless-producer if you don't have the Rector but at the same time it's more outs.