Knluk my jX-pro is really the cause
Your grinder is fine. It is a lovely grinder, which is what I have and use daily for espresso and pour overs.
You said, you have two shots:
1: Your latest video is good. I can see why you are saying it is channelling. Keep everything constant, coarse grind by another 4 micro clicks, pull a shot and see what happens. A click or two in JX pro may not make a difference to the shot. I doubt I can tell the difference in taste.
- Since it is a dark roast, pull a shot with 1:1.5 and see if you like.
As advised by folks here, get Illy and get another a medium roast bag and see how it goes. If you have a roaster nearby, go to them, see if you can find a medium roast bag roasted 2 -3 weeks ago and use it.
Worst case, if you are out of coffee, go to Waitrose and get an expensive small coffee bag (not powder) you can find and get that if and only if there is a roast date (not best before). The waitrose bags will normally have a roast date. Do not the buy if the roast date is more than a month. If I am out of coffee beans, I won’t drink coffee. Period! 😊
BTW, what are the flavour mentioned on the bag? Since, it is a dark roast, you may find Cocoa, (dark) chocolate and nuts.