My theory is lag pressure is caused by the, "down" in the, "forward, down and out."
Most people have the back, up and in, the forward and out - but not the down.
Impact to Low Point is 3-D; Down, Out and Forward. The Forward Dimension is taken care of by the center of the motion (Left Shoulder is the center of the Clubhead Arc, unless replace by the Right Elbow). Focusing on Down and Out on Plane to Low Point is a must. However, "most" swings lack the Outward Dimension during the Impact Interval. Conventional instruction has drilled home to swing from inside, to along, to inside. That only works if, the "along" is at Low Point, generally it isn't and neither is the Outward.
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