I'm brewing the lady liberty ale from John j palmers book for my first all grain batch. I have 1 oz of williamette and 1 and a half oz centennial left over from a previous batch. I'm wondering if i can substitute for the oz and a half of cascade and half oz of northern brewer the recipe calls for. I'm on my way to my local homebrew and can pick up any other extra hops if necessary. Any advice would be greatly appreciated.