Mark,
As promised here are some print screens of the Illustrator works.

This is the first step, two parallel curves with red guidelines. See the red vertical line where the tang begins? See how the tang is curved?
Now here is a close up of how I cut the lines at the tang guidelines and moved the tang lines closer.
Now from the parallel lines at the tip of the blade I first move up from
A to
B the blade width at the tip. Then I will twist is to get the proper overall shape.
In the overall shape little details of the blade's profile have been added. Now the tang doesn't look as curved as the original first drawing, but nothing has changed.
Hope I have cleared this
Thank you and everyone else.
BTW, I'm on a laptop and don't have your present email. Care to send one just to add it to the address book? Thanks