Problem with z-offset

[asimitabi]

Hello everyone,

I have the problem that my Z-Offset cannot be set or only via a "stupid" detour.
I use a BLTouch sensor and use the G30 for homing the z-axis. Here I brought out a difference value (with G30 S-1), with which the nozzle then rests on the bed. So far so good. But that is not the height of the nozzle that I would like to have for printing. Of course I could enter the value in G31 as Z probe trigger value or adjust this value accordingly so that the Z offset is optimal for the printing process. But I want to clean that up and have the value there that the nozzle needs from the bed. So I would like to enter the z-offset from there individually.

I then tried the following first:
I tried using G10 P0 Z [offset parameter] to enter the offset for the extruder (tool P0). That did not work, the printing still starts low at the level of the trigger value.

Then I tried to enter the Z offset in the slicer, this value is not adopted either. I use the Prusa Slicer, here the Z-Offset can be entered under General Setting (Printer Settings). No success here either.

Then, just to print, I ran a print and used the "Baby Steps" function when printing. Just to see if this value is at least adopted, I increased it to 3mm so that a change would be clearly visible. Here the Z-height has also not changed.

So it seems there is something in my software that repeatedly fixes the Z height to the trigger value from G31.

Is there a good way to set the Z offset individually or do I have to write the Z value in G31 in order for it to work?