Hi Steven, thanks for your comment on the live stream!splashalot wrote:Hi Marc.
Really enjoyed your first live-stream.
I have two questions for your second live-stream:
Firstly, do you have any flow-control related tips for reducing bitter notes in my medium/dark roasted favourite blend (Brazil, Colombia, Indonesia, Kenya) from my recently (~5 weeks ago) acquired Niche Zero?
Secondly, flavours and characteristics using conical vs flat burrs. I bought a Niche Zero (conical burrs) to replace my trusty Macap M4 (flat burrs) and am noticing more bitter notes and less chocolate flavours with the Niche, as well as a reduction in body and creamy mouthfeel. This is confirmed by back-to-back testing both grinders on my flow control equipped Profitec Pro-700 at ~94c/201f and with no flow control voodoo magic used.
Is this just a conical vs flat burr thing? As my prep and all other factors are the same. I get no bitterness and great body/mouthfeel from the Macap at 94c on the Profitec, so I suspect it's not brew temp related.
I'm just starting to post here in the marketplace. I've limited myself to YouTube for the last decade and replying to posts there. I try as best I can to reply to every question and comment. It's tough to stay on top of them. It's often 20-30/day and I try to be thorough with detailed answers but I have to leave some time to do testing and videos!
In reference to flow tips. If you have not seen it, check out this video I posted about a week ago with 5 different flow profiles based on coffee type, age etc with most of the extractions done a Pro 700 at 200F:
It has some starting points to use. In general, I find a high flow to start, about 1 1/4 turns open for 15 seconds and then gently ramping down the flow to near zero at the end helps reduce bitter flavors. My favorite in the video using a not fresh Italian style blend was a lever style profile: Open 1 turn for 3 seconds, cut flow for 5 seconds then quickly open to 1.5 turns and ramp flow till end. One of the better shots I've had from a coffee I'm all to familiar with.
I can't comment specifically on the Niche as I have never used one. Not a great comparison, but I used the Sette and E37S in the last live stream and I have a slight general preference of the flavor of the larger flat burrs with many of the coffees I use. As with everything espresso so many variables so I'm not locked into that opinion.
Hope that helps and do check out the livestream tomorrow!