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hazzelfrazzel
Flandria
Dogtemple
No idea if this would help for your situation, but I had a (older) Ultegra brifter that jammed while shifting to bigger cogs. The shifter felt mechanicaly blocked, so you couldn't 'flap' it to the left. I solved it by removing the shifter from the bar and tightening the allen key bolt on the back (where shifter meets bar) to remove a slight amount of play. Had the same problem on a R8000 Ultegra shifter, but that one lacked the allen key bolt on the back so no chance to adjust. Sent in for waranty at LBS...