Hi. I really dont use the tool changer options/modes.
I have found more easly to run multiple gcodes per bit/operations and perform manual changes for the bits/file.
-i use a bitsetter, so all my bits are at the same height in the z axis (i cut mostly 4-6mm sheets)
-i use a safe z height of 20mm in all my machines (that way the one that have the floating z axis works with the vbits correctly) i use the same pc/software to generate all the gcodes and that way i avoided messing with the machine settings
There you can see what im talking about.
Regarding the z height: its only measured for one of the bits at the beginning