I have prepared a technical paper that I will send.
MSL monthly averages for Grand Cayman and Settlement Point are available from Proudman Oceanographic Laboratory for 1986 through 1996. Settlement Point is still operating but the data has not been supplied to Proudman's Permanent Service for Mean Sea Level. I don't know how to access the data.
I have written a technical paper that I can email to anyone interested. firstname.lastname@example.org