I would suggest reducing the caramel malt (most people don't go above 1 pound, 1.5 at most, even in big beers; you don't need to scale up specialty malts proportionately when "imperializing" something).
Also, you have all three of your hop additions at 60 minutes, which will leave you with plenty of ibus but pretty much zero flavor and aroma contribution. I'd use something neutral like Magnum for bittering, and throw all of your Centennial and EKG in at the end of the boil, as well as some extra for dry hop.
No idea how "new" you actually are at the hobby, but if you only have a few batches under your belt, I'd hold off on making a 1.090 beer for now. Try the same beer reduced down to 1.055-ish, and if you love it but want more alcohol, then try it again with the higher OG. (The vagaries of yeast health in big beers aside, if the recipe doesn't turn out well, you don't want to end up with 5 gallons of 9.3% abv beer that you don't enjoy. You'll never drink it).