Just a thought re the darkness, almost black crema and bitterness. These are signs to me of over temperature and/or very slow extraction. You could consider brewing at a different time in the gaggias heating cycle- you could wait longer after the heating element turns off, or you could flush out any boiling water after the element goes off. You could also try dosing just a little less, because if the coffee is in contact with the showerscreen too long, or the brew time is too long...Originally Posted by dsc link=1174665207/0#0 date=1174665207
A PID is brilliant but you can also play around with temp surfing. Try 2mcms tamping method, works for me- fill , tap on bench, level off, sit tamper in to compress a little, refill, level off then tamp.