Thanks for sorting this out Brent, all makes sense. Also different end stops triggering could explain the distance difference.
The firm pressure on the front moved the bed considerably and I think it must have leveled it up. It’s not something I felt comfortable doing or will be doing again. I will be sticking to leveling using the Y rails as you originally suggested,
The variations to suggest to me that doing Z level using blocks should be done regularly and a hot calibration before you print is the best way to get a level start. It’s dead easy with this sensor and the calibration macro that I run from Octoprint. I have now added it on a button rather than using it in a start gcode.
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