Frank -
I did an overlay :
NOTE: My image may be incorrect if my choice for "apex/center of camber" is incorrect.
The (very) thin red line is the latest overlay we are looking at. The thicker green line is another overlay base on this image :
The 9.0 degrees is an interpretation of the red and green lines. The 12.7 degrees is the slope of the "shadow" over the EV-1. The EV-1 "shadow" is closer to a straight line from the apex, while the other slopes are more more curved (I hope that makes sense).
Base on the slopes I am seeing, I am going to split the difference and say that the "goal" should be an angle of close to 11 degrees (at least for the EV-1).
CarloSW2