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@JB
Yeah, tbh I don't have any experience with automatic machines (I have only used manual machines) so am not sure. Less of a quick blast and just a gentle flow of water into the puck before the machine ramps up the pressure with the remaining water.
Best to control one variable at a time. So, using your same measurement as last time, increase pressure with the tamp. If it still flows too fast, that's when you'd up the dosage as well.
EDIT: preinfuse is possible if you mess around with the steam wand. Probably avoid for now...