MuddyOne Either should be ok with your bottomless, just to see if it makes a difference.
@MediumRoastSteam is great at helping people trouble shoot. While he expertly guides you, I have a question for you, considering the beans are just 3 weeks old.
Were you experiencing similar taste issue with any other set up? You may have already mentioned it earlier? Do you drink as a straight espresso or dilute it with water or drink as a flat white?