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I use 2 twisted pairs of a 8-pairs shielded cable in a 4-wire connection. No issues whatsoever. Cable is around 100cm long.
If you can't move the nozzle either up or down, you may have your M208 settings in config.g set incorrectly.
https://miscsolutions.wordpress.com/mini-height-sensor-board/ has quite good explanation. It is for IR probe but search for g30 s-1 and around there is the process to figure out Z for g31 described.
Z parameter tells for g31 at what height the probe triggers. Because it is not going to trigger at 0 and not at -0.02 as you have currently defined.
Neat this was a Q I was getting to once my Wanhao D6 is upgraded and I can get back to building my CoreXY D-bot.
