Hello Mayo. Yes, I did surface the entire table top, with the exception of the far end part of my table shown in the figure, where I didn't want to cut down deep enough to clean up that area.
I do have Z springs. I have to work on evaluating where the Z-slop is coming from. My total Z play as noted above, was .020". I haven't ever disassembled my Z assembly. Hopefully it is straight forward.
Chuck Keysor (circa 1956)
PRT Alpha 60" x 144" (circa 2004)
Columbo 5HP spindle
Aspire 8.5, Rhino 5