any particular reason you want to run it at 1866? It's only rated for 1600, and some RAM just doesn't overclock. You can try messing with the timings a bit at stock speeds but you will probably make it unstable, overclocking RAM is so much more finicky than overclocking CPUs or GPUs, but there really won't be any performance difference. My advice is to stick with what it is rated at.
You tried the auto clock settings for the RAM in your BIOS? Did you try setting it to manual and setting the clock yourself? I'm guessing you did since you've been messing with your timings. Also what CPU do you have, RAM clock speeds can also be dependent on your CPU.
Try setting CPU host clock to 233MHz, this w/ the DRAM multiplier (Memory Clock) at x8.0. Also manually adjust CPU NorthBridge Frequency and HT Link Frequency to 1864 (x8.0), including the DRAM Voltage to whatever your modules are rated to run at, I think it's 1.5v. And if you hadn't already set the DCTs mode to ganged. If this doesn't work I'm spent lol.
Wow, got past the boot menu which I though was great it might actually work! then all these other errors came into play, the OS would not load, PC kept restarting, the the OS started to go through the cycle of repairing itself.
I went back to the BIOS's Defaults in the end! aha that was not cool xD
only other thing I can suggest with the manual clock settings at 1866, and your timings at the RAMs spec defaults, try stepping up your CPU northbridge voltage a little bit and your RAM voltage a little bit. Sometimes you can step it up a little at a time and get the desired results.
But I will say again, you won't notice any difference in performance between 1600 and 1866.
yeah the only thing it'll boost you in is benchmarks, in actual performance you won't notice any difference at all. Well I'm sorry I couldn't help you figure this out, keep this open and I'll stay connected, so let me know if you get a chance to try the stepping :-)