I wish you had posted this at a time of day (in my time zone) when it is appropriate to drink coffee.<p>I have never weighed the coffee in my espresso because its strength is, to the brewer, a factor of grind size and packing force. The volume of coffee and water is consistent. That means that someone who is on the weaker side might user a finer grind to compensate for a lower packing force whereas someone who is stronger and does not take care to use appropriate force might use a courser grind to compensate for their excessive force. If those two people each pull a shot and the infusion pressure gauge reads the same for each, the weight of the coffee in the filter basket should be the same, right?