Just looking at the rotation, shouldn't one really put BfB after Disembowel instead of ID as that'd let you do the second Full Thrust with it still up? I have craptonnes of skillspeed since I only recently started getting FCoB loot, so I can play around.

Also, something that's bugged me for a while - on the second rotation, you will have Life Surge up for the rotation's first TTT but not BfB. Do you pop LS without BfB or wait for TTT-HT-TT (at which point BfB becomes available) so you have both up at the same time?