The B3 is unnecessary in that rotation, though. Since UH flare uses 2/3 of your mp and the second uses the rest it shouldn't matter how much mp you generate between cycles. You can transpose into B4 into double flare with or without B3. The only benefit would be the reduced cast time of the first flare. Conversely, if flare also benefits from the 1.8x AF3, would it be even better you transpose> B4> F3> flare> flare?