Would Duality working with combo effects be a bad idea?

[MrCookTM]

Since this disagrees with the math I posted earlier, I looked up Shasta's NIN guide. Neither his reddit post nor his forum guide go into the math beyond "don't delay it so long that you lose a chance to use it later." The math I did earlier says that it's fine to do AC->SF->MU->DualityAE, because that's still a pps increase over using it for AC (just barely). Until someone points out a flaw in my math, anyway...

Could have sworn I read that in Shasta's guide, though maybe my interpretation was just hella off lol.