I am using a kit to brew a backyard Pilsner. It contains 2 oz of Perle hops and 1 oz of Saaz hops. I have made several other types of beer kits that have come out very good after adding some hops after fermentation. I have an ounce of centennial hops I was thinking of adding at the one week mark. Will that be a good addition to this type of beer? Any other suggestions? Or should I just continue to follow the recipie?