I never tried it, but off top of my head this doesn't seem right.
If you B3>B4>T3>Foul>F3, you're looking at 2.5+3+3+2.5+2.5=13.5s of casting for 240*0.7+260+390+650+240*0.7=1636 potency, yielding 121,2 pps, roughly.
If you do F4>T>B4>B>T3>Foul>F3, it's 3+3+3+2.5+2.5+3=17s for 260*1.8+260+390+170+650+240*0.8=2200 potency, thus we get 129.4 potency in the best scenario that you get an instant mana tick. If you do not, then it's always lower.
You might ask "why that Blizzard?"- because if you don't use it, you risk losing UI if you wanna get all the spells off (no fastened casting of F3). I'd say with our speed, you're guaranteed to lose it. If you want to remove T3 from the rotation, you have to wait for the third UI tick anyway, so you essentially get one less spell for the same window (you can shove a Blizzard there) and it's also less pps.
Also note that the comparison is unfair. If I compare the 2400>B3 to the other one over the same time window (17s), the first has already finished a F4 and is already casting the next. That would be, for a 16.5s window (finished the first F4), a pps of 127.5, virtually the same as the "best scenario" for the transpose version.
I disregarded Enochian because you multiply both values by the same multiplier. Someone feel free to double check the math though.
I'd say at best they're the same, at worst the Transpose version loses. Not to mention that any movement going from UI or UI II to AF III is seriously more threatening to that version (much slower cast, so if you need to stop F3, you'll have to hit Transpose again and be thrown into dps loss hell).
Also, might as well add that if you make the mistake of starting to cast a F4 at 2400 and notice halfway through the cast, given these numbers (that I had never considered before), it seems it's best to finish the cast and hit Transpose.
Hope this was helpful.