I have a caadx and recently changed my cassette from 12-28 to 11-36 using a RoadLink setup. I'm using an Ultegra 6600 for my rear derailleur, 11-36 deore cogs and deore 10-speed chain. The cogs,chain and hanger are all brand new.
But my problem is with the 32-t and 36-t gears. Shifting down (small to big), 28→32 and 32→36, I have no problem.
The problems comes when shifting up (big to small) from 36→32 and 32→28. Sometimes when I shift, nothing happens, and when I shift again, the chain will shift twice or sometimes once.
I have no problem shifting up or down on the 11-t through 28-t gears.