Xtool P2 with lightburn focusing

I’m trying to get this all process of manually input the focus g code into lightburn
So basically measure the distance from the top of the material to the laser
Example distance 24mm -5mm material =19
So it would be GOZ19 the code for that material
But if I have a thicker material like a 3/4 19mm
If I measure from the top of the material I’ll have 8 or 9mm if I deduct the the material 19mm I’m in the minus now what
That’s where I get confused

Also the laser doesn’t fire sometimes or doesn’t move down, and it looses connection to lightburn at times has well

Any suggestions?

Thank you

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