I have a kit of Platinum 2666cl10, I ran perfectly fine on RIVE with a 4930K, Try with 125 blk, when I set XMP it set blk to 125 and ran perfectly.
Try the memory presets in the bios, I ran these sticks using the Samsung 2800 mhz settings at 3000mhz, just to see if they could do it. I used the voltage in the preset which didn't automatically set. 2.1 volts. I was just playing at that point to see how it could handle it, ran a screenie and turned it off.
Even if the 2400cl9 is the same memory as the 2666cl10, the secondary and third timings may be different. this is why I would suggest trying one of the presets in the bios