I just did a regular double shot
#coffee is super bitter and idk why
full thicket
what coffee is this?
full thicket
you may find it bitter for your taste regardless of what you do, though i'd probably start with a shorter ratio if it is overwhelmingly bitter. something like 15:15 might be a good starting point
prep looks fine
mellow fjord
wouldnt 15:15 be more bitter
more concentrated
anyways, whats the consensus on pressure? do i need to fill the basket to the brim and when i tamp there needs to be very little space?
i heard if you fill the basket like halfway there is channeling and basically like 4 bars'
full thicket
well, the latter part of that isn't really true
the water fills a little slower and lets the puck soak gently so there may be some changes, but i don't think you're going to see a precipitous drop
15:15 will indeed be more concentrated but this doesn't mean it will be more bitter; compounds seem to extract at different rates
sinful ibex
wouldnt 15:15 be more bitter
Also if it’s less bitter but too concentrated you can just dilute it a bit to 1:2 with water
Bambino doesn’t go that low 
mighty jackal
The Kirkland blend is a pretty darkly roasted coffee (Starbucks roasts for them iirc) so it will typically be pretty bitter. Pulling a shorter ratio would help, but if you keep hitting bitter, coffees this dark work really well in milk drinks 😀
You can also try to grind a bit coarser. This will make your shot faster, which can temper bitterness a bit.
So something like 15:30 in 20seconds