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Thanks for the info! The reason I was asking is because I recently put a DIY sub-compact double with 24/42 rings without ramps on my tourer. The shifting is “okay” with the rapid fire xt shifter but I have a pair of xt thumbies on another bike that I could swap. Might give it a try - if it doesn’t improve the shifting it should at least be more reliable.
The barend for the front has it's roots with a well-hated front derailleur, the 5800.
For all the trees in Finland I couldn't get it to work properly with the RS785 hoods, probably also due to the actuator arm hitting the tyre. Swapped out the 5800 for a Shimano Z-series but I guess cable pull has just evolved too much in 40 odd years. Hence, the Ultegra 8spd era barend.
I love it for the front der, especially because I use chainrings from different makes without chain guides and rather custom chainlines and chainring spacing. The barend doesn't give a shit, it just works. But I would never use it for the rear, brifters ftw.