To amend the image sampler, the circle radius size

Hi, currently i am having different sizes of the circle, how can i have it consistent like 10mm? And having the circle not clash? As i am making a facade panel for 2000mm by 1000mm.
Test Wave_5.2.gh (247.0 KB)
image

Test Wave_5.2 Edited v0 dimensions for fab.gh (265.8 KB)

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