Are you sure the tool table is in Metric when you put the 6mm probe diameter in? Normally 4 decimal digits is Metric and 5 is Inch
Possibly a lot of backlash in the Axis. Attached: _Troubleshooting_Axis_Positioning_Problems-VMC-110518GEW.pdf
With the OP700 and OPM400 these are digital probes and you should check with Renishaw in Chicago; but normally a Graphite probe stylus is required.
The ceramic is too heavy. The Calculated probe offsets are about 0.01573 larger on the diameter.
You trammed the bore with an indicator and then ran just the G72 1st?