I mainly make charity quilts and I use Layout A. I open the glue bottle tip a little less than fully open, plus I hold the bottle about 12 to 18 inches above the batting and move fairly quickly from side to side. These two things keep the glue from being applied too heavily.
No offense to those who want to paint the glue on, but that just sounds like too much trouble.
One thing for sure, I'll never go back to using pins.
Tate