Have you tried going onto your motherboards website and downloading the latest bios and driver updates? What OS are you using?
Get the RAM to run at 1866. To begin this, disable or turn XMP off, it won't work well with two sets, the programming is for the packaged set. Manually set the freq to 1866, set the base timings to 9-10-9-29, set the CR to 2T (or 2N if the N designator is being used), set DRAM voltage to 1.56, set the MC voltage (believe it's CPUVTT on your mobo) to 1.18 and give it a try. If any problems may need adjustments to the advanced/secondary DRAM timings (notably the tRFC) just check it and if on the lower end, try about 164.
Use my advice with caution I am not responsible for anything going wrong.