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I believe that your block is suffering from a thin baseplate. At 1.1 mm thick, I assume that those lines are some kind of grooves that you traced/milled/scored, making the bp even thinner, at that area.
Your baseplate is too thin, if it's not going to have any fins.
I don't know what your pump and cooling solution is, but I bet you could improve performance significantly by going to a bp thickness of 3 to 5 mm, IMO.
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