Mark & Will,
I am very happy to report that my problem seems to be resolved. I had installed the Y axis homing switch backwards so that it missed touching the back frame by perhaps 2mm and I never noticed that. After correcting the problem, the homing procedure appears to be perfect. They touch, stop immediately and back off those points by a few mm... does this sound normal?
I have attached a screen shot of the log. Please review and let me know if it looks correct for my Shapeoko XL. Also, please sent me a link for setting up the home position (starting point) for any job.
Thank you for your expert help!