Also, what temperature are you fermenting at and what Yeast are you usng? It's just a hunch, but based on what you've said it sounds as thought it might be on the high side.
For example, some recipes for this beer call for Safale S-04
, which is going to give you best results when kept between 59-68ºF. Keeping your fermenting beer within your yeast's ideal temperature range will payoff bigtime in terms of quality of the final product.