Thanks for the replies.
Circles don't need to be smaller, that would take us to far. If it would be possible to increase radius by x2; x4; x6; x8? Obviously, then less circles need to be present.

If it is possible it would be beneficial if different sizes of circles can be present.

The amount of rays is surely sufficient, no need for more.

Overlapping is no problem, don't need to do anything about that.

Thank you in advance! peter