I first want to preface this by saying I am not mechanically ignorant, I understand the basics of how derailleurs work, but I need the help of the big brains of weight weenies.
My issue is this.
My SRAM red black rear derailleur shifts beautifully on a SRAM xg1090 (11-28) cassette except for the jump from 12T->11T, my previous 11-25 cassette had the same issue. The cassette is on a meilenstein 10 speed rear wheel. The chain (KMCx10sl) will make the jump but it often pauses before doing so. When in the 11T it makes a slight rattling sound like it is not perfectly seated on the sprockets but will never actually skip. The skipping can be manually stopped by pulling the derailleur body, slightly, away from the rear wheel. Now, I know what you are thinking - too much cable tension - I have tried unwinding the tension and it still has made no difference. The other thing you are thinking is the limit screws, once again I have looked at this, the derailleur does not actually touch the outer limit screw when in the 11T. I have adjusted the B screw as well thinking it might be lack of chain wrap causing the lack of smoothness but this too is not an issue.
I am currently running Gore ride-on cables with KCNC Ti cable, but the same issue existed with the gore standard steel cable too. The cable is clamped correctly to the derailleur body (I have another identical SRAM derailleur on another bike that is functioning perfectly to comapre against). I have checked adequate lubing of the bottom bracket cable guide.
I have previously removed by inner and outer cage of the rear derailleur for sanding, this freed the parrellogram spring, but i believe it was reinstalled correctly and the only jump that isn't smooth is the 11-12T.
Any other ideas I could try, I crave your wisdom.
Evo 5.02kg SL3 6.77 Slice RS 8.89 viewtopic.php?f=10&t=110579
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