What rear derailleur are you using? I don't have an answer to your problem but am curious because I have had similar issues with my new to me Atlantis. I've now ridden it about 600 miles trying to get used to how it came to me. Shifting, particularly on the large cogs in back was very finicky - sometimes noisy, sometimes skipping, sometimes hunting, sometimes shifting on bumps. Rideable but annoying. Initially I figured I just needed to adjust to new to me gear but patience wore thin. I thought maybe the Shimano Deore XT derailleur was tweeked as it is pretty marked up but first I double checked the hanger alignment and tweeked it a bit. May have helped but still not great. Checked again, still not satisfactory. Ditched the Silver right hand shifter as it constantly needed tightening and installed an old Suntour barcon. That was better but still not quite right. So, I was thinking the derailleur must be tweeked but then I noticed that it would not hold any fine trimming in between ratchet clicks, which seems bizarre to me. I finally decided to replace the rear derailleur with a Suntour VxGT. That appears to have solved my problem but I lose the chain wrap of the XT (something I'm not too concerned about because I don't like cross chaining anyway). I had been wondering if anyone else had similar problems and thought your problem might be related. Is there some adjustment on the XT that I am unaware of that allows infinite trimming?
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