Sorry, I stepped out for a bit.
I will reset to default values and do another video for you Gerry with screen included
What had you changed? What you posted before were the defaults.

What is your Safe Z set to? Is it set to Machine Coordinates?

Third attempt, works great with a 5.3 offset and same settings as above. go to zero and it just kisses the work piece
Not great, as Z zero should be 5.3mm above the workpiece.

Leave the Material Offset unchecked until you get it to zero reliably without plunging. This just adds more complexity to the equation.


Second attempt, with clearance set to 20mm Goes up! but plunges too far when set to top of work piece.
Can you try this again, and tell me what the DRO says when it finishes? If your plate is 16mm, then it should finish 4mm above the plate, and the Z DRO should read +20.000

After probing, the macro sens a single G0 Z move to the clearance plane, which should be UP.