I'm running 10 speed Centaur carbon levers with an 11 speed Record rear derailleur without any issues. It's a short cage derailleur if that makes any difference.
I think I've read somewhere that the new 11 speed medium cage derailleur only works with the 11 speed Centaur levers, as I discounted getting one of those to allow me to use a larger cassette on another project.
I'm running 10 speed Centaur carbon levers with an 11 speed Record rear derailleur without any issues. It's a short cage derailleur if that makes any difference.
I think I've read somewhere that the new 11 speed medium cage derailleur only works with the 11 speed Centaur levers, as I discounted getting one of those to allow me to use a larger cassette on another project.
Hope you get it sorted.