[andrew1]

If the two larger circles had that ratio then it would imply that the two circles in the bottom left and bottom right would have the same radius. Which they don't appear to. So the ratio between the two larger circles must be slightly smaller, 1.5ish maybe.

[pointillistic]

Yes, you are correct. This seems to be the flaw in the design then , i.e. no organic relationship between the two clusters except the arbitrary golden section boundary.