I'll probably make one block with let say 6mm base thickness, and then test block get data mill down to 5mm, test. So on to 2mm this way I gotta find the optimal thickness. And yep Al and Cu results will be different that's obvious.
But I must disagree on importance of the top it doesnt help at all, I had plexy top on one of my prototype block but it leaked a little (no o-ring) so I soldered Cu top and the results were the same. You must consider that I use o-ring desing and that the contact between the top and the bottom isn't perfect at all, so heat transfer -> not good.
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