In fact, Garruck is not my main concern, it's cabal therapy.
I found it quite strong, but...
but it's too slow or clumsy against fast combo or reanimator decks. But it can't do anything with top/terminus and when the game slow down, it can't deal with opponent's topdecks...
Testing force of will is a fresh air and freed the manabase from that early black mana.

But that comes with a price : you have to run a fairly high blue card account.
In my tests against the metagame, a lot of players got some delvers, creeping tar pit or TNN and garruck was a pretty poor play in those situations.
I've won another tournament yesterday with the list i posted and i never missed the fat man.
In fact, I never feel like i have to win fast since i got a few tempo trix and force of will to back up

You should try it.