nitpick wrote:Is it really that subject to equipment nuance in real life?
Yes, it can be, especially with Silvia and Rocky. As a former Silvia owner, I have to tell you that she's very fussy indeed, and from what I hear Rocky ain't so great either. It doesn't matter that the pair cost over a grand. I ignored the advice of the much more knowledgable people on this board and bought a Silvia for my first machine. I got rid of it after 30 days and never looked back. As they tried to tell me, Silvia is overpriced for what you get. A tad more money will get you a much better machine. But that's not the whole story. I think your problem has more to do with the coffee and the grinder. Here's what I was in the midst of writing when you responded to Dan:
nitpick wrote:Try as I might I simply can't get a straight shot of Intelligentsia's Black Cat Classic espresso to taste anything like Intelligentsia describes it (sweet, syrupy, chocolately, etc.). In fact, it usually tastes like the bitterest swill imaginable.
Don't feel bad. I was never able to get Black Cat to taste good on my Silvia, either. For one thing, Silvia doesn't take well to updosing. If you're using the stock Rancilio double basket, 17-18 grams is too much. I found 16 grams to be the practical limit. I was able to do better with an LM/Synesso ridgeless double, but not a whole lot better. Most of the good shots I pulled on Silvia were in the 14g-16g range.
nitpick wrote:If I back off to 14-15 grams, 196F, and 25 seconds I get between 1.4 and 2.0 fluid ounces (the difference is one click on Rocky) and a drinkable shot, although not one that I would associate with the superlatives usually heard about Black Cat Espresso.
Many have commented that Silvia muddies the flavors. That's probably due to the poor temperature stability. However, since you're quoting temps I assume your Silvia is PIDed. Even then, what's going on at the boiler and group head could be quite different. One of Eric's probes in the group head might help, if you haven't done that mod already.
But you have a sort of no-win situation here. If, as the reviews suggest, Black Cat requires updosing to reveal its flavor profile, but Silvia can't handle updosing at that level, you're not going to taste the full flavor profile.
nitpick wrote:I'll note that the grind settings for Rocky to produce anything within the standard window of 1ml per second of shot are all pretty close to the "zero" setting (two or three clicks up) and the coffee feels very fine -- certainly much finer than the Black Cat Decaf that's coming out of my Baratza Vario.
You lost me. You're using a Rocky for the regular Black Cat and a Baratza Vario for the decaf version? That's exactly backwards to what I would do. I don't think there would be much argument from members of this site that the Baratza Vario is vastly superior to the Rocky. It's on the order of a Super Jolly or better. I used a Vario for about 7 months before upgrading to a K10. I kept the Vario as a second grinder, and will continue using it for second coffees, decaf, drip, press, etc. It's not a 68mm conical, but it's by far the best grinder you can buy for under $1,000.
If I were you, I'd clean the decaf out of the Vario and use it to grind the regular Black Cat. If decent results can be had with Black Cat and Silvia, the Vario will get them for you.
Of course, it could be the coffee. I disliked Black Cat so much that I never tried it after my Silvia days. I was going to give it another try with my GS/3 and K10, but after reading the reviews in the Espresso Blends 2010 thread, I changed my mind. Evidently, it's not what it was, and there are too many other great coffees to try.
That said, it shouldn't taste like swill. Make sure your temps are stable and predictable, and try the Vario.