Some others might chime in with some good ideas. But before the new BJCP guidelines come out for use next year, your best bet would be in the Specialty cat (depending on how close you came to cloning AB). I would describe it as an Arrogant Bastard clone attempt with American Strong Ale as your base beer. Be sure to list IBU levels, hop type and aroma present, and even noticeable malt flavors/aromas. This is simply to help the judges better understand what you were attempting. Although, I am sure almost all judges have had AB in their past.