Hi guys for those curious about SP specs for boss fights in Hellfire I have some resources available below.
T17 4pc Bonus: http://i.imgur.com/vwDNpG7.png
T18 2/4 pc Bonus: http://i.imgur.com/OE9N6Fp.png
Explanations for these specs can be found in the following 20 min video: https://www.youtube.com/watch?v=KKWQKBNOq9M
CoP is useful for 4 fights MAYBE if adds die quickly OR if you don't move much in a fight. Otherwise AS is the recommended and better spec for 9-11 fights.
Stats for AS are as follows:
1.4. Auspicious Spirits
Stats for CoP are as follows PLEASE NOTE THERE ARE TWO STAT PRIORITIES: 1 for ZERO movement and the second for fights WITH movement.
1.2.1. Single Target: Traditional or DoT Weaving with No Movement - Stand in fire.
1.2.2. Clarity of Power Lite, Multiple Target, or Movement
CoP Pre-HFC rotation guide:
https://www.youtube.com/watch?v=AaqbX-5Kpc0&feature=iv&src_vid=Z9F0WImoslk&annotation_id=annotation_511062745
Things won't change much/at all in HFC rotationally for CoP since most fights will be done in AS spec even with 4 pc bonus.
Overall take-away: Since you are not going to be baby-sat and will get yelled at for standing still - Crit and Haste are the 2 stats you want. For AS especially since Crit is worth more than int and spell power.
Vers is universally a useless stat for SP - so unless the piece is HEAVILY weighted towards Crit with a hint of Vers - I won't be rolling on it. But if it replaces a Spirit piece then it might be better than that!!!