First off #1 nice video, #2 I'm no expert by any means, so take my advice with a grain of salt.
I recently obtained the Breville DB and have been trying many different things on it. I use to own the Breville SG and later upgrade to a Baratza Vario which seemed to have more control over the beans. I've read the grinder plays a critical role in brewing a nice shot, maybe even more important than the espresso machine itself (some have said).
I also am using a 20gram VST basket.
Anyways the SG is stil ok to use though.
I noticed that you weighed beans before grinding. Keep in mind that its almost impossible to get the same weight of beans out of any grinder than you put in. Some beans will stick to grinder and dark beans even more.
I typically weigh the empty portafilter (tare it out) and then weigh it after the beans are added. This way you know the exact amount of beans being used for you extraction.
I also weigh my shots as they come out to compute the brew ratio. I've read a brew ratio ~60% is good.
Lastly your shots in the cup in the video seemed like a lot more than 2 shots...that's why weighing shots helps too.
I also heard about stopping extractions by observing color of shot...stopping as soon as you see the shot blonde...
Lastly the best judge is the taste. If you like the taste, you're doing something right,
I thought my taste was good until I started messing with grind, weight, extraction time, etc. and realized how much better I could make my shot.
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