My espresso is very good (by my taste and from friends/family), but we can always do better...right? My equipment weak link is my Rocky grinder so I already WDT. This was a big help. Now I've been playing with freezing a dose of beans overnight in an airtight container and grinding right away. It seems to me that I'm tasting richer, more depth of favor shots. My question is...is this all in my head or is there really something to this technique?