Damn, they're all so good, I feel like I should just flip a coin. I'll go with The Die Is Cast for this round, I think it has a few more minor flaws than the others. And, I suppose, one significant flaw: the Eddington thing where he sabotages them and then immediately renounces his own sabotage, which really doesn't work at all.
Duet - 0
Improbable Cause - 0
The Die is Cast - 1
In Purgatory's Shadow - 2
Tacking into the Wind - 1