Because I still see a whole lot of people talking about it and using it, I wanted to let people know that Transpose out of UI -> F3P is no longer a thing that should be used at all.
Technically speaking you still can do it, however there was a change to the way AF1 works, making transposing out of UI and casting F3P essentially the same damage as just hard casting F3 from Ice. Based on the numbers, you're much better off just using the F3P during the AF section you got it from, than trying to save it.
Edit: For those who are thinking I'm going off the tooltips and not my own testing, I'm not saying it's not a gain to transpose F3P anymore, I'm saying that it's more of a gain to simply use your F3P in your AF3 phase now. Yes you gain some damage doing a transpose F3P line in that moment, but overall you'll lose damage.