I had to do the Brewdog Elvis juice three times to get it where I wanted. Mostly just improving my practices. But I liked the hop combination right off the bat with my Citra, Simcoe and Amarillo only version of the recipe.
But for a similar taste of something that had more grapefruit flavor without the grapefruit, the single hop IPA with just Cascade hops added during the boil without dry hopping beat them all.
Brewdog Punk IPA, the 2007 - 2010 version is the current favorite. Though I substitute Cascade for the Ahtanum hops. Don't know if that makes much difference though. I only substituted because the place I got the rest of my hops from was out or Ahtanum. The Motueka hops adds some interesting notes
As for your 2 hop brew, if you don't have any other recipes to follow, then I'd just divvy up additions at 60, 30 and stuff a bunch in at 0 or whirlpool. I've not been much on dry hopping lately since I seem to be getting all the hop flavors I care for at the end of boil.
Not sure if one favors bittering first addition than the other unless maybe one is cheaper.