I have Omhotah's issue, too. I thought it was just me, but my DPS was significantly lower than it was on comparable fights. Having an Ilvl of 384 without Legendary and without Lust, I roughly pulled 29.5-30k, if I wasn't randomly melee'd by the Boss or died due to pushing the limits of activating Heroic Will.
Started the fight working towards Solar, I've noticed the first Hour of Twilight occurs when you have 5 Lunar energy left. It gets very very close when you try to clip the dots (since they'd likely fall off on the way to Solar) right before you enter the normal realm. I'll try heading to Lunar first on Sunday, maybe this works out better, since one mostly clips DoTs in Solar anyways.
At the risk of going even further off topic, why do you have only 5 lunar energy left in your first cycle to solar? If you have T12 4pc, it's only 4 casts of 25 energy each (assuming no euphoria/DW procs), and without T12 4pc it's 5 casts of 20 each. You shouldn't be casting starsurge until you hit solar, because it adds an extra cast in there (and with T12 4pc you shouldn't hardcast SS outside of eclipse anyway).
This might be a Boomkin specific issue really, as Affliction locks and such dots continue to tick while in the physical realm, and they aren't constrained to reapplying at specific criteria. When we have to shift for that second it seems to really dampen our rotation and reapplication of dots, putting a huge detriment on our DPS.
Just curious, are you suggesting our dots don't continue to tick when we're shifted? I wasn't paying very close attention during the fight (I was way more worried about missing a shift).