a. I can raid 0 two M.2’s on the extreme board via the M.2 slot and the 4th pci-e slot with a hyper M.2 x4 card? I believe so but the gains are minimal,
http://www.thessdreview.com/daily-news/latest-buzz/understanding-m2-3xraid0-nvme-boot-performance/b. Using the 4th pci-e slot disables sata-e lane? see kkn's responce
c. I can have a 2nd SATA III raid 0 volume? Yes
d. I’ve never really used XMP, always manually set RAM timings. If I use manual setting to OC the CPU and get the BCLK up to 200 will that effect the RAM speed in XMP? see Nates responce
e. I was eyeing corsair dominator 32GB DDR 3200 (PC25600). Does this still make since with my OC goal? GSkill Trident Z is probably the best, purchase the speed you want, Z-170 can run ram at crazy speeds