I had problems when I installed su with your boot image, half hour and ballz still spinning, and thought the correct setup was to use the boot image from the su page (seemed right since that setup booted right away) so my issue is to get your boot.img to work with su, I'll go back to your boot.
My procede was fastboot your boot/system fb -w to clear out system, reboot straight into twrp, install su beta from zip, reboot into system, and it sticks there at the spinning ballz, I am doing something wrong in that?
you need my boot.img, my system.img
and this BETA-SuperSU-v2.66-20160103015024.zip that you can install from TWRP recovery
http://forum.xda-developers.com/showpost.php?p=64161125&postcount=3
the last supersu beta, automatically patch your original boot.img. If you install the stock boot image patched, you lose half of functionalities on this firmware.
You need full Android boot.img, not stock image.
I thought this was very clear to everyone.
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