John,
Right on it! I knew it was a good idea to take a picture & ask y'all . After your post, I cut a piece of paper & compared the angles. I hope I have enough leeway left to correct. Should.
I tried to downsize all the dimensions to about 88% of correct ones for a 64"er, and incorporate the "slight bend-through-the-handle" idea from Pat B. You can't see much (if any) in this picture, but I'm aiming toward a handle which is really rounded in the palm area and then "pours" into the fades, only about 1.25" thick back to palm. I'll do some more & then post some more (resized) pix. Muchas gracias, Compadres!