This is pretty much the same way I have mine.
Except I left the black/ground wire in on the receiver, I found that without it, it glitches like mad.
And I left all 3 wires in the plug on the BEC, I don't think there is a need to remove it I.

My receiver can handle the extra voltage but I prefered this way (directly powering the servo) because I don't need to keep plugging in and removing the ESC pin to adjust settings (HW Xerun).