I switch between coffees very frequently, lately I have been cupping 7 or 8 at a time after roasting. Espresso is the same, I like to keep small amounts of 3 or 4 different kinds, and try most roasts (within reason) as espresso. Is keeping the hopper filled with more than what you are needing to grind at the moment worth the coffee waste, extra hassle, and weighing complexities?