Originally Posted by Manus Domini
Feet close together through whole stance: Pinpoint
feet apart through whole motion: platform
feet sliding forward: hybrid
best of both worlds, worst of none, but in between
weakness is that the toss is the hardest to control because of the movement (from my experience)
I guess this is the best explanation. Also, make sure you're not dragging your front foot while serving (left leg for righties). That would reduce the power going into the serve from your legs.