I don't think you did anything wildly wrong. I probably would have opened Horse Traders/Silver, too. I think I would have gone for Silk Roads a bit earlier, working on winning that split, and then supplementing with Islands, Halls, and Estates when I hit $4, $3, and $2 after the SRs were gone. But, your opponent didn't go for them right away either, so that bought you time. And you did beat him on the split. So yeah, I think you're good!