Yarbo 8000 is indead a little stiff but great value for money. I also use the Yarbo SP-PSC-3C to my speakers (Klein & Hummel O300), a little expencive but perfect quality. The guys at Yarbo know what they are doing ;-).
Do you use USB on the ref 10? Because then you have to try the Ortofon DGI-K2 Silver USB. I used the Audioquest Forest before and switched to the Ortofon, this realy opened up the sound without any harsh. It's not very expencive compared to other pure silver (data wires) cables.
Where did you buy the Ortofon DGI-K2 Silver USB from? I'm only finding it though Japanese websites.