After days of pitiful attempts, with the occasional mercy shot which helped motivate me to stay with the effort, I can now report five super tasty shots in a row, with two different beans—Brazil Fazenda and my Italian blend. When I can figure out exactly what I am doing that seems pertinent I will pass it along in this thread so hopefully it will be of some use to someone else.
For now few critical points in helping me to pull a dependably tasty shot on the pre-millenium two-switch Europiccola:
1. As Fullsack and peacecup said:
Tried Jack's technique this morning, I think he nailed it. I turned off the machine at 6:45, when steam first started coming out of the safety pressure valve. My only deviation was to grind, dose, distribute and tamp after the warm-up was complete, so the shot wasn't pulled until 9:00 minutes after the start.
If I let my 1 bar running valve get to blasting steam and then pull a shot, the fluid will pound the puck and and produce a shot hotter than tar on Texas asphalt, with a taste to match. When I hear the steam starting to gently seep out of the 1 bar running valve and I confirm brisk steam out of the steam wand, I just turn off the machine and get the shot pulled within the next minute.
2. No 10 second preinfusion with the lever held at the top—on my machine it would seem this will not allow any resistance to be built up at the puck in relation to grind fineness and tamp firmness (obviously this works for many and their particular machine, but there have been several threads with people who could develop no resistance at the puck no matter how fine they ground). Just take the lever to the top carefully, hear the group fill with water, and without delay draw down the shot.
3. Of course, fresh coffee! I am grinding just a touch finer than I do for my Ponte Vecchio Lusso (maybe 1 notch on the Rocky scale, and one or two notches finer on a Macap M4 scale), but not as fine by a couple of steps as I ground on my old E-61 Isomac Zaffiro vibe-pump machine.
Thanks to any and all, on this thread and others, who helped me get up to speed on my new-to-me Europiccola! I could not have done it alone, nor would I have persisted. I am so glad I did.