I've been chasing the dragon and trying to nail down this recipe for 4 months. While I don't have access to simcoe, the zythos blend seems to be working. This is my recipe (in its third iteration) -
http://hopville.com/recipe/1163322/imperial-ipa-recipes/knuckle-sandwich-to-the-balls-imperial-ipa
First one just finished bottle conditioning and its pretty close, but at 8.3% ABV, not quite there. Second batch should come in around 9%. This third batch (posted here) should be the one. Will let you all know later.