Is there is way to determine how much divergence there is between the target line and the Crossline plane of 10-5-E when using different club? It seems as though the farther back in the stance the ball is placed the more Crossline the Delivery line will be.
You are very correct.
Here's the way that I see in the visual of 10-5-E:
We all agree that the ball is moving up plane as you move it back in your stance. Also, the three dimensional path of the clubhead is one that appears to be inscribed on a horizontal plane (your eyes are above plane). So, the ball played back in the stance (up plane) is being struck well before low point. The opposite is true for a driver, as the ball is impacted very close to low point. So, the visual changes dramatically.
Now, take a SW and stand at address. Waggle (arms not hands) the club above the ball. Move the club from the ball to a point opposite the left shoulder. The clubhead should be covering a straight line to 'right field' (impact to low point). But, the same drill done with a 3 iron will have the club covering a very short line from impact to low point and will appear much less crossline.
For me, the feeling of left shoulder's location relative to the ball is the key. I keep the feeling of the club moving 'out' until it gets in-line with the left shoulder. So, 'out' with an up plane ball position is really 'out' and 'out' with a downplane ball position is 'out' a little. Keep the clubhead covering that straight line between impact and low point (a point opposite the left shoulder) and you'll be fine.
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