I’m inclined to agree with this,it must be a tractor problem.Kuhn ploughs are simpler than most to set up,I certainly wouldn’t start cutting bits off.Cutting bits off the plough isn't going to fix the problem if they aren't causing it!!!!
Is the plough turnover lean angle correct? Is the plough pitch correct?
Is the front tyre outer track width the same as the rear outer track width?
Are you inadvertently turning the steering into the ploughing and causing the tractor and plough to run crabbed?
If you let go of the steering where does the tractor want to go, straight, out the fur, out into the ploughing?
What tyre pressures are you running? Are the tyres worn evenly? What percentage wheel slip are you getting? Is the diff lock engaged?
There's many, many things left to investigate, alter, and adjust before starting to cut bits off