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I want to make a perfect semicirle, whose elements shrink towards the end. I can do a perfectly well semicircle without the shrinking, like this
But, if I try to shrink the CIRCLEs(with s .99 or something), the overall shape of the semicircle is broken.

How can I compensate for this? Is this possible at all?

I think the problem is the 'x 1' in your loop transform. If you shrink the circle then you need to reduce this displacement. Otherwise there will be a gap between your circles.