Did you resolve the problem of the leaking of the solder? As I remember, you had an issue with your first prototype, where the solder completely clogged the block.
I think that your scoring demonstrates how fins work better.
If I had the tools, I'd make and send you another base, where you'd have a bp of 2-3 mm, and fins that stand 3-4 mm tall, out of a single block of copper.
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