Taz 6 Z Offset range

Dear all

Is i possible ot change to -2mm Z offset maximum to a higher value.
It is for sure limited by the firmware.

I use the Etched bed for the Taz6 with a 3mm bed on top (glass with pei).
But I cannot lower it more that -2mm.

The nozzle is still too hight and I am not able to print.
Also changed the first layer height to a lower value but no success.

When I look from the side I still need to go around 2mm lower to reach the surface.

So please is there another way to lower it more?

Cheers c0x10