No experience but just about to make the exact change, I will be using bar end shifters too- what size cassette are you using?
12-30 but may go up to a 11-36 (I hate the 11spd sprocket, a 12 is much better). I'm using 6700 STIs, otherwise I would probably go for a full dyna-sys 10/11spd RD and a microshift bar-end.
@hamrack started
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No experience but just about to make the exact change, I will be using bar end shifters too- what size cassette are you using?