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		 Roger, 
Sounds like you know about these lines.  I must say that they really don't feel that much heavier.  I fish mostly 10 wts through the season, here and down south.  I have 10 wt intermediate lines by Wulff, Sci Angler and Cortland and there really doesn't seem to be two sizes difference.  I will however give that the running line is thinner and the head shorter.  But maybe that is the difference.  The local shop who is a very experienced life long fly guy claims 1/2 wt higher.   
But, it works and that's all that matters. 
		
		
		
		
		
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