Damn Kelly ! Good research done ! I wish I had the time to do some research like this.
Don’t forget the delection of the vertical !
https://geodesy.noaa.gov/GEOID/GSVS/deflection-vertical.shtml
I’m wondering if you have the time to help Dave on his issues. I’ve never encountered MLLW vertical datum along the coast. I’ll try and see if I can help Dave also.