Notes over a week or so:
Beans roasted 2-2, received 2-4. Attempted to accelerate rest of first 2-3 shots of beans by placing in the hopper overnight.
First shot - 203.3, very slightly overdosed, extracted to 1.9 oz. A little sweet but not terribly, heavy crema, and a smoky/woody flavor that lingers like dust on the tongue. Pulled a little too fast at 14 sec., and lightening a little more than I like - by both appearance and flavor, slightly overextracted.
Second shot - 203.3, slightly more overdosed. Pulled to 1.75-1.8 oz or so, and still too fast. Sweeter, juicier, still with a little wood/smoke, but much less. Needs grind adjustment before I can make any judgments here.
Third shot - 203.3, more heavily overdosed plus grind tightened. Pulled to 1.8 oz or so, 25 sec. Near the end, it started to bubble and some popped out of the spout. Espresso was good, smoky/woody with a little juicy coffee flavor, but I have the feeling it would have been better had I cut it off at 1.5.
Fourth shot - tightened grind further, 203.3, overdosed a bit less again. Pulled 1.25 oz or so, too tight.
Fifth shot - Only slightly over level, bump temp up to 203.6, pulled 1.3 oz. or so, much sweeter/juicier now. Will relax the grind back to the second setting and try again at 203.6, pulled to 1.3-1.5 oz.
Day 4 and Later
8 or 9 shots in, and then revisited after a week and a half and a few more bags:
Tricky. I found that the sweet spot tends to hover at 203.3 to 203.6, with a < 1.5 oz pull, wanting to move back and forth a little on the edge of going bitter and occasionally dropping over the other side. It mellows a little on the lower end of that scale and down at 203 and so avoids the bitterness, but you can sometimes can get noticeably more sweetness at the higher end if willing to tolerate or risk a little bitter thrown in there. Also, if you like that smoky/dusty flavor and feel on top, pour it a little longer (my wife loves this so I've continued to pull her shots at 1.75 oz or so). Another thing - this definitely needs and improves with a few days rest, and I found that I could just dump a 1/2 lb. bag in the hopper the night before starting use, and since this only takes 3-4 days to go through, it does not stale unfavorably.