If I've read correctly, you need help accurately adjusting your Z-offset? Glad to hear you're making some progress!
These are the steps I went through when adjusting mine with a BLTouch installed: Home all axes, then move to Z=0. Increase or decrease the Z-offset as needed, a little at a time to prevent colliding with the print bed. Repeat as needed until the nozzle is about paper-width distance, or using whatever tool you prefer for bed level testing, from the print bed.
After this is done, you can use this distance to manually level the print bed.
