The standard Vectric post processor will Plunge in Z to the working clearance after the tool is probed for offset. the Vectric post processor solves this problem.
The M6 function for UCCNC has the following behavior:
After setting the tool offset the spindle will rise to safe clearance then execute a G00 G90 X and Y move and return to the position in X and Y where the M6 was called. This is important especially with Vectric as it will dive in X Y and Z to it’s clearance position above the workpiece.