Hi Steve,
Thanks for the advice! After some more testing yesterday, I'm thinking about cutting the Misdirection for the Echoing Truth. I agree, Sensei's Divining Top is really important and Misdirection was mostly a dead (blue) card.
I tested against Punki who was playing 5c Stax, Goblins (his own creation) and Iona Oath=>Tezz after board ("Tezz or no Tezz!? That's the question!"). Recently, Punki has been top 8-ing every tournement he played in!
After boarding, the Stax matchup seemed to be in my favor. Strip Mine is a pest though! Sundering Titan proved to be amazing. I remember you having a discussion about the Titan a while ago...

Goblins didn't win a game but it was a deck he was just trying out.
Iona Oath proved really difficult! I believe it gets a lot better after boarding, safe for the fact that Punki was working with a transformational board into Tezz! If I face Oath and suspect a transformational sideboard, I won't board in 3 Gargadon's...
The lack of Duress/Thoughtseize was felt heavily yesterday. I'm going to test your list with echoing Truth for Misdirection and a version with Duress/Thoughtseize. I hope to be playing a toournement this Sunday...
The lack of more playtesting was also felt heavily yesterday... I need more time to play!!
Greetings,
Robrecht.