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This is interesting discussion, but if you've done this many times there should be logs somewhere with concrete numbers to back it up.
I was wondering about something I cannot work out how to test using Simcraft: specifically using the Felguard whenever Demon Soul is available and then swapping back to the Succubus afterwards.
Answering a quite old post here :
I don't have simulations to support this either, but many raid tries.
In my experience, starting the fight with the felguard and then swapping to succubus does give a huge dps boost, however, swapping in-fight back to felguard to get his demon soul ability seems to be a dps loss (since you have to stick with him for 45s or hard cast the succubus summon).
The best way to handle this, for what i know :
Soulburn roughly 4s before pull, in order to still be able to use your potion before the pull,
Start your usual spell cycle (Meta > Demon soul ... ) while using felstorm and pop the succubus when you're about to start casting some shadow bolts (you should still have the soulburn buff) and go on with your fight normally.
I usually get a 40-45k burst at start, sometimes going over 50k.
As previously said however, this is only for single target fights, since you'll keep the felguard in aoe situations.