How to fix drag knive overcut

[ROTM]

Good day.
I have just finished cutting with the Donex drag knive d2 a thin piece of cardboard 0.016"
There are some areas where it cuts a bit too much and some where it doesn't cut to the end.
I am guessing the problem it is my settings ...but how can I fix these?
Attached a pic of the dragknife settings and one of the issue.(I'm using vcarve pro)

Any help would be appreciated.

Thank you!