Shifting isotrimmed surfaces and making them smaller with an attractor curve

Hello,

a have another issue which I need help with. I have a divided domain with isotrimmed surfaces.

I somehow want to shift every second line of these surfaces to alter the grid (number 1) and making them smaller depending on the attractor curve (number 2).

Here is a screenshot of the grid along with the description 1 and 2.

The solution is simple I guess but somehow a cannot manage to get the result. Can someone help me with this?

Thank you very much.
Stefan