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shifts fine without a wheel in it. odd that the di2 derailleur sort of "hangs" vs a normal mech which springs back on itself. is that normal?
OK so it must be something to do with the b screw. back it off completely and it shifts super smoothly on the smallest 5. it can go up to the largest (34t) but really struggles because the jockey wheel catches on the cassette.... there seems to be a happy medium where it all works ok but shifting isn't super smooth. clearly needs more tinkering - had no idea b screw had such an impact
swedeee-
The flappy hang is normal.
The photos make the part cjr is talking about look stock but I don't have mine here to compare so I'm going by memory. Bike makers fucking around with stock RD parts would be another explanation for it not working though - if they've installed the wrong mount. Maybe it needs their part? I'd definitely find out if the builders installed the wrong bits and I'd definitely shy away from bikes that need not only a custom hanger but other custom linkages too? That's dumb.
But it sounds like you've adjusted the B-screw and it's ok. Maybe it was installed piss the first time and then wasn't clearing the cassette after that due to B-screw?
hippy
If you take the wheel out and shift what does it do?