You both totally NAILED IT.
Thank you so much.
Setting the fade to zero under motion in Marlin 2.1 eliminated the squish. It was driving me nuts.
I do not understand why the value of 10 worked with the original bed and the +1.5mm shift resulted in the ~8mm value of squish. I might play around with values of 5,4,3, 2, and 1 to see if there is any noticeable value to the option at all.
Again thank you
Brian