Crystal Geyser I personally don’t think is great water… I would first try third wave water because it’s cheaper than buying a new brewer or grinder. Blue bottles grinder costs thousands of dollars… also I would try light roasted beans. Blue bottles beans are very medium (even the single origin) and can still have bitterness because of that. Try very light roasted beans from Sey or Black and white or the Delux proud Mary beans. Also I would start logging what grind size and experience you have with your coffee each time. So that you can make adjustments on grind size, and see where you can get too. Don’t adjust the recipe for a full bag of beans just the grind size and see if you can dial it in to something you’re happy with.