Cant adjust z offset

my response was:

I see.

OK, well I will advise on the thread thats the case.

Try to loosen the screw for the prox sensor and slide it down as far as you can.

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I had a similar issue early on. In my case it was one of the switched inside one of the Z linear modules. I pulled the top caps off both, clicked the switches, reinstalled the caps and the problem went away.

Could it be the the X-axis rail is out of alignment on each tower? That might explain the nozzle appearing to dive into the bed. Easy to check, home the machine then SWITCH IT OFF then push both sides of the X rail up as far as they can go. Did one side move more than the other? This is something you should do when ever you change a head or have a bit of an “incident”.