The swordmasters are a good pick, but I'd drop the Talisman of Loec. It's useful, but when you use it, you lose your unit Champion, and that's not really a good tradeoff. At 1500 points, you don't really need the Banner of Sorcery if you've got a pair of Lv2 mages. I'd drop one of the repeaters in favor of a pair of great eagles. That solves your problem of quick units, and honestly, between the Lorthern Sea Guard, a bolt thrower, and the Shadow Warriors, you've got a fair bit of ranged power. Then there's the mages, and if you use a lore besides High Magic, you've got a fair bit of offensive punch there too. I'd probably do one with High Magic and the other with Lore of the Heavens or something. As Hesph said, you'll get your flanks rolled without something quick to counteract the other army's fast units. I found I had to adapt my army list for the same reason.. infantry are just pretty damn attractive in the new book, so I don't blame you for the initial setup of your army!