Having a hard time using thew 256 steps Xrite i12pro2 target

I seem to systematically be getting loads of “false measurements” in the Piezography pro tool when trying to linearize using the 256 steps for Xrite i1pro2 target (see attached partial column of measurements) . Is it just because there is no averaging at all since each level of grey appears only once or is there maybe a way of improving the target so as to improve the measurement procedure?
The 21x16 target consistently seems to be working smoothly for me, the problem occurs only with the 256 steps target. Which is why I wonder if it is only an “averaging” problem or if the target can be designed differently, so as to make the measurement procedure more efficient using i1pro2?
Many thanks

Bump the smooth and smooth boost to 70 and 70