So am I correct if I understand it like this:
On a dummy 4.0 rotation is better as more F4=more dps, as one would think.
In an actual fight you should use an UH opener but then go back to 3.x rotation, cause, let's face it, an actual fight isn't a dummy and you will be forced to move. As soon as you lose 1 F4 in 4.0 rotation due to movement/mechanics it falls behind 3.x rotation.

On a side note, did anyone try not using B4 in normal rotation and only using it in combination with Triplecast?