Both Hans and Gunther are entered in the big autocross in the sky.
I really don’t know why adjusting the steering box is verboten. Maybe that was Hans and Gunther’s little rice bowl??
I have adjusted and corrected the steering box of others a few times. Seriously, if you can remove leaves from the front beam and re-assemble, then I would say you have the skills necessary to adjust it.
If you adjust it too tight, then, as expected, it will be hard to steer. A little bit at a time and test.
It’s not black magic.