Well, Vertical to the ground at Impact, for the Left Wrist, is also Vertical to the Plane of the Left Wrist Cock. But for the Right Forearm Wedge, Vertical to the Ground is not the same as Vertical to the Plane . Both Wedges are Vertical to their respective Planes at Impact. That puts them at 90 degrees to each other.
It doesn't sound like your Right Forearm Wedge is On-Plane at Impact.
I "fly" the wedge down the plane. Like a flying wing. Because everything is turning about a remote center ("head") my elbow is moving -on plane - an my shoulder is moving and supporting the hands.