This is the error report from the printer target. You might be able to see the random red crosses on the top line of the chart.
I think the numbers I got with the Ilford matt paper were similar or a little worse; your histogram is better. If you right click on cross, you see the RGB values. PP will make a cross if any RGB number is close to zero or 255.
The profile prints fine but I am still struggling to get that jumper the right colour
I found, when editing the matt paper profile, I needed to reduce the saturation and reduce contrast to match the test print in the editor. NB. this means the edited profile gave more saturation and contrast; remember you edit to
match the test print.
Terry