Okay, ordinarily this would go in the super long 5.4 WW PTR thread, but I just found something that I think requires its own thread.
We've been going along, trying to figure out what in the world the deal is with WW's DPS on the PTR, thinking that level 90 talents and mastery were the only things that had changed for single-target DPS, and have been separating SEF from the discussion. Today I remembered something that we found out way back when SEF was introduced: the spirit will not copy your abilities on the same target, but it WILL copy FoF as it is technically an AoE. It will also continue auto-attacking. As it turns out, SEF was heavily buffed on the PTR, such that with one spirit out (can't put both on the same target unfortunately) you do a combined 150% of your original damage (75% each).
I hypothesize that using SEF on your current target (with 4 banked chi, or chi brew, whatever you like) followed by a TP, RSK, Jab, FoF combo (followed by a swift /cancelaura Storm, Earth, and Fire macro) will do roughly 30% more damage (50% more on the FoF but 25% reduction on TP, RSK, and Jab) in that 6 second window than without SEF. Using TEB with this combo amplifies that gain. I just tested it on the PTR, but unfortunately the NPCs that sell gear are not available at this very moment so I can't test this with a proper setup on my template character, but I did a rough numbers check and the SEF + TP + RSK + FoF combo is producing roughly 30% more damage in that window than without the spirit, and this would be incredibly inflated with a low to no haste Crit/Mastery build with Assurance of Conquest (FoF is one of the cooldowns lowered, down to 16 seconds with the normal mode trinket based on math).
I could use as many bodies as possible to test and verify this before I go crazy. Help me MMO-Champion forums, you're my only hope.
Edit: Update again, neither TP or RSK actually affects the spirit's damage if you take away all procs and look at it empirically, making total you + spirit damage about 131% rather than 150%. This is still a big gain but for theorycrafting purposes it means that you don't have to RSK or TP after summoning the spirit, just SEF and let the spirit get into attack position, FoF, and dismiss.