Hello Marcus, thank you for your sharing your experience! We have discussed some of the points you make. I think our situation is slightly different from yours in these ways:
-width of 3m is fine
-depth is as shallow as possible, we try razor blading the top cm's of soil rather than cultivating. So force on the equipment is small.
-we use vertical plates and other small implements for pushing ground into the row, high speed is not necessary
The front implement causing sideways disturbance in steering is something we will probably have to overcome but we're hopeful it is doable in our situation. In my experience of manual driving so far, it is only noticeable when driving on a slope. The autosteer software could probably take this into account as Agopengps does now with the 'draft gain' parameter based on the roll.