You're right. Bonebolt definitely has a decent chance against FSS. Possibly >50% depending on the build.
UPDATE: UT and I just had a strategy session in irc since no one else cared to join. Here is a summary of what we came up with.
= 2x bonebolt with fractal
-previously discussed
= devtal (to non-Lt/Gen) and Fire stall (to Lt/Gen)
-we figured that they will use the SS stall against us again, and it works much better with upped cards, so an easy counter to that is firestall
-with their grabbow gone (might have more?), devtal should be able to beat all of their unupped decks
= grabbow
-grabbow is win for us
= poisonbolt
-expecting grabbow here, but could see PU dragons as well. This seems like a logical counter to both. But open to other ideas
= mono-aether
-should beat everything they can throw at us, but needs further testing. While I hate using 6 dims against a weak opponent, beating them this round means another easy win next round.
= EQ Phase dragons
-wondering how functional their immonova deck might actually be (if at all), so the low-risk play is to use EQ. They also have a lot of CC, so Phase dragons are probably better than grabbies. Open to other ideas, but this seems like the low-risk, high reward play.
Obviously the event card can change things pretty drastically, but I think this is a good starting point.