I record one verse or half a verse at a time using punch in looping. The loop starts conveniently about two measures before the vocals. I record maybe two-four takes in a row, and then do some audiotioning to make sure I'm on the "right tracks".
Sometimes I record one phrase at a time taking a dozen takes in a row.
As my lips are practically touching the pop-shield, the distance to the mic doesn't vary. My routines during the louder parts are fairly fixed so that the volume is not a problem.