Issues with 12 speed cassettes. I am having a problem getting it to shift into the last 11 tooth cog on two different wheelsets. I have backed off the limit screw so much that it has over-shifted on the outboard side so I don't think the limit screw is the problem. It will actually shift to the 11 and then about 2 seconds later it shifts back up to the 12. if i hold the button down, it will stay in the 11 but as soon as I release the shift button, it shifts back to the 12. I did replace the wonky looking narrow/wide type pulley with one from a 6800 ultegra derailleur I had laying around. That helped shifting all over but the 11 cog is a mystery. When I use an 11 speed wheel and change it to 11 speed in the settings, it has no issue shifting the entire range.