Thanks for the suggestion.
Setting stroke-linecap to round just resulted in a rounded corner only at the corners that were notched before. If I set stroke-linecap to square, I receive a much better result for my needs.
I end up with one tiny aberration on the "A" in my logo. I tend to be nit-picky but I can probably live with that!
Now I can move on to making the diamond shaped points move like compass points, pointing to a users mouse cursor or finger location. It would great if the pointed form tottered on the Z axis like a real compass. Time to go on a search for how to do that. Any suggestions for compass like animation greatly appreciated but probably best for another post.