Offset after full fillet

[Nitro]

Such situations happen a lot.

The solution is tough:

Direct modeling doesn't always work as it should

Hello everybody I can no longer edit the ring in height if a 180 ° rounding has been made (inner and outer edge max. Rounded). The curves themselves can no longer be deleted. Even with surface projection, I can’t make the ring any higher. Is there a trick? Here is a video: [Prop Schutz Shapr3D]