Question about tamping and pressurized portafilter. Is it correct that tamping pressure isn't important with this machine. That is the impression I've gotten from what I have read. If that is so is there any advantage at all to tamping either harder or softer. Also does a 53 mm tamper work, the one that comes with this machine is awfully flimsy even if you don't have to tamp very hard. I measured the plastic tamper and it is 50 mm, 53 mm looks very borderline as to whether it will fit or not. Also, any idea how big the included scoop is? I started using 2 scoops for a double shot, and that seems to work ok, but I am curious exactly how much that is.