I measured CCFC error signal with different length LEMO cables for CCFC LO (attached figure). The CCFC amplitude was 132mVpp. The red and green curves in the figure represent the CCFC error signal with red and brown+green LEMO cables for CCFC LO, respectively. As you can see, the CCFC error signal with brown+green LEMO cable is close to I phase. So I will use the brown+green cable for CCFC LO.