the ID of each tube directley effects the size of cup it can cool.
if you keep them the same size and spread them out it will leave hot spots that are not cooled enough.
if you look inside the cascade you will see the ID is already very small and going any smaller will also reduce the cooling effect of each tube so you could end up cooling only a fractionaly larger area.
to cool a larger area i would try larger tubes with larger cups but designed to be used with a bigger pump.
at least thats what i think anyway
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