TAZ pro Level Repeatability

I’m trouble shooting a bed level issue on my TAZ pro and I have read the TAZ6 thread with the shims, When I run the Gcode to turn off auto level M420 S0 then home everything G28 then the G29, I get different values for the corners each time without any changes. I have looked over the sled and head mount for any abnormal slop or wear. I currently have a single nozzle 0.5mm head installed.

How repeatable should the corner probe results be, within 0.1mm, 0.2mm etc…?
Any known “check this first” for not repeating corner probe results?

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