hmmm. i almost always do 30g with 510g water.
the grind you mentioned sounds right. i call it “slightly coarser than reg drip” definitely as coarse as french press.
i do not time the pour.
i’ve found any change in method/type involves needed time for taste buds/expectations to adjust. then a aha moment will kick in (for me). but i will say the chemex switch was pretty immediate.
i try for no longer than 15 seconds post grind to start bloom. a 45 sec min bloom. then i slowly and circularly pour the remainder of water in trying to keep color on top consistent.
17/1 is water to coffee ratio
the process you describe sounds like it should be getting you good chemex coffee. except i don’t know about pours that big. i’ve never done that. maybe try starting with half that just to experiment, because obviously bigger water = longer extraction which could very well = bitterness.
just some thoughts.
on my end i can definitely vouch for 30/510. wish i could pour some for you to try and we could experiment and get you settled!! but maybe chemex isn’t your jam just as mokapot isn’t mine? no shame in any of those games!