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Are you using steppers or servos?
It's possible you are observing  low speed stepper harmonics. If that's the case, the solution would be to alter the motor gearing to avoid low motor speeds in the harmonics range.

thanks, yeah I think that is the problem. Sorry again to ask: Should this value be positive or negative in my case, where the machines homes on the min X/ Y side (and switch is on the moving gantry) --

I assumed negative as the HOME_OFFSET specifies the position of the limit switch in relation to the actual home position. Is that correct?

Enter these numbers in your var file...

kcjengr.github.io/probe_basic/probe_basic_parameters.html

You need to update the var file parameters, also in the docs.

I'm not sure what you mean about the tool table and the rack the rack stores tools the tool data is stored in the tool table. The rack holds whatever tools you put in it they don't have to be in order it tracks them persistently as long as you have the var file set up. When a tool is loaded from the rack and you use the offset for stored in the tool table everything works as expected it works perfectly fine with cheat code. You call the tool not the rack number.