First, the XMP profile is actually overclocking. The JEDEC settings in the CPU-Z pictures are the "normal" or "guaranteed" speeds. It's real easy to call up XMP and enjoy a good overclocked profile.
Second, Corsair DRAM often has some headroom for additional clock frequency and/or tighter timings. The drawback is the need to tune manually.
As Arne suggested, CR is an important setting - it's involved with every transaction between CPU and RAM. Try reducing it to 1T in BIOS and make that the only change. Boot and check stability.
Timing can be tuned by going down the list in BIOS reducing the counts one at a time in step of one. Reboot and test, rinse and repeat.
Make only one change at a time so the culprit is obvious when the rig goes unstable -- when, not if. Make friends with the power button, clearing CMOS and saving profiles.