One of the simplest ways that many bands use to improve their recorded output is to write way more songs than they are actually going to record. While this is heartbreaking that some of your “kids” may be left on the cutting room floor it can help you immensely improve your creative output. It is rare that every song someone writes will be a masterpiece. When I produce a full length from a band I usually ask them to write twice as much material as we are going to record and then demo it. We all decide what is the best of the material (including doing some outsourcing), and only record those songs we think will really help the band. This can go a long way in record reviews describing you as having too much filler as well as harnessing your best material to make the best record possible.