Hi all I am revisiting my Dolly prusa clone printer as I have't had

Hi all I am revisiting my Dolly prusa clone printer as I have’t had it working for some time. I am still having the problem with the z probe not doing what I tell it.

I have reloaded the firmware from Toms website and set the z offset but once again it it keeps raising to high when i goes to print, I have enabled and disabled the eeprom to see if that would make any difference and it doesn’t.

I have adjusted it via m851 and on the firmware and any which way it will not print at the correct height. I have also loaded the latest Marlin from the web including the daily bugfix build but I just can not get it to work.

There seems to be a lot of information on how to set the probe offset ie
m851
m500
g28
g29
then take measurement and include it in the firmware etc but I still get a positive lift when printing.

Are there any settings I am missing within the firmware or something.
Many thanks in advance.