Daryl,
Can you add the effect due to the vertical component of the plane?
As I see it you have laid the path on the ground. did you?
But for horizontal hinge the club face is vertical but the club head is on plane. OK? The vertical element is made up by the "dual" component and the residual #2 still uncocking. ok? but in angled hinge neither comes into effect because of the on plane clubface. Just as a rough estimate. for a 45* plane angle the vertical and horizontal clubhead arc would be the same. Does this make sence to you?