CoreXY mesh probing issue
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Here's an example of using a macro to measure the exact z height and save it.
https://duet3d.dozuki.com/Guide/Ender+3+Pro+and+Duet+Maestro+Guide+Part+5:+Upgrades/54#s221
The example assumes you have a probe already configured and calibrated to find Z0 reliably first, but you can substitute the G28 in that example for manually setting G92 Z0 when the nozzle is touching the bed.
That guide also goes through BLtouch setup.
