Just been using SPlat, but only with 5 SoSa's instead of 6, because I don't have 6 and instead throwing in a tower into the mix. Strange thing is, in Plat with this I have I'm estimating a 85-90% win rate with about half EM's. I'm beginning to think 5 SoSa's is 'better' because it doesn't screw with the mulligan as much, and you rarely need SoSa #6.
In any case, least for now, best upped farm is still SoSa decks, but for this one I'll have to figure out what the full deck is like.