I know that this is a long and serious thread and I have only skimmed it briefly, but unless I missed this somewhere, it might be useful for me to pass on a couple of things.
First, the Empathy Quotient is available and automatically scored on line. It is found on
http://glenrowe.net and is part of what Baron-Cohen uses to measure Asperger's/Autism.
Second, at the INTJForum a number of people have taken it and recorded their scores. The empathy range is as follows:
0-32 Low (With the average Asperger score at 20)
33-52 Average (with the mean female score 47 and the mean male score 42)
53-60 Above average
61-80 Very High (80 is maximal)
Twenty-nine people recorded their scores and the average of these was just over 30. Might be worth trying here at typology central.