TAZ Workhorse Probing after changing to Archim2

Just managed to switch out my original RAMBo board to an Archim2. I loaded the software using the DrunkenOctopus tool using r66 revision, Archim2, hardened extruder and normal probing.

Using my usual startup script it usually heats the extruder, wipes the nozzle, and then goes to probing the 4 discs. After updating, the wiping process seems to go OK, but it completely misses the discs and just rams into the print surface. M851 won’t allow me to change the offset as they have to be 0 for the nozzle probing to work.

Is there a step I have missed?

Thanks
Joel