Did some assessment on repeatability, found two results...

Took a few random tools, zeroed the Z axis with my Haimer probe and then swapped tools, going to G1 Z0 F100...
T1 0mm
T3 +0.06mm
T8 +0.09mm
T10 +0.08mm

Now, before i dig any further, do those figures seem reasonable for a Bridgeport conversion??
No point looking for issues that are OK or can't be fixed.

Second result - with the Haimer probe fitted, if i repeatedly approach Z0 at F100 I get perfect result of zero every time. If I increase speed to F200 I get an error of +0.03mm, going to F300 or above I get an error of +0.04mm every time.

My thoughts are a following error in the servo setup maybe, overshooting and not correcting possibly?