Yeah, looking at it, I agree with keeping the Jaces in. I forgot about my outs to Iona. It's tough to board out against Reanimator. I dislike boarding out SoFI because it lets me race past a Jin-Gitaxias, Core Augur, who is their number one go-to nowadays. I can definitely lose the SoFF, maybe a Mystic, and maybe a land since I don't have to worry about Wasteland.
Against BUG, Paths are better since they generally run no basics. I'm not really worried about them aggroing me out, so another answer to Jace (as well as creatures) in the form of Oblivion Ring seems right. A resolved Elspeth is pretty bad for them, but I could see not boarding it in depending on their creature suite.
Counterbalance is bad for the same reason it was bad before Mental Misstep. There are too many things for it to deal with and it just can't deal with them all. Green Sun's Zenith, Knight of the Reliquary, Vindicate, Tombstalker, Vendilion Clique... etc... etc... Snapcaster Mage outclasses Counterbalance all over the place.