[BUG/Enhancement] Round corner outside the field

[Tensuko]

Map: Somewhere in Thuringia.
Field: 136
Problem: Round corner on first headland looks good, but it should be shifted inside the field if possible.
Debugfile: debug.txt
Screenshots:

Addition:
Same for when a 2nd round corner is selected. Physics have limits, so the deep corner can't be worked on then.