http://pastebin.com/Q1A815Y7
Looks good (for each of four disks).
=> Grub2 (v2.00) is installed in the MBR of /dev/sda and looks at sector 1 of
the same hard drive for core.img. core.img is at this location and looks
for (mduuid/ad9fa861cc3b7cc3409746ed14c25431)/grub2.
Could you run grub2-install using additional parameters
--debug --debug-image=all
and send me output of grub2-install? debug-image will enable debugging
for loaded grub image so you hopefully will get a lot of output; it
may give some hint where it stops.