I, too, really quickly became to nail down my sound when I began to write my own stuff. For about 10 years, I did originals only, which is pretty rare for a Blues band. In the past couple years I feel like I've established my own thing enough to start adding some covers without a hint of feeling like I need to sound like the original...or anybody other than myself. I also think that anybody who created art necessarily feels a certain amount of dissatisfaction. If you felt like you'd arrived at your destination, there would be no reason to keep striving. My son is a total genius musician...child prodigy...now he's 29 and doesn't play at all. The dissatisfaction was too much for him.