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2mm is pretty good, Mine is a bit too thin and I was concerend it might crack and leak so I checked it a few times, Seems fine atm.
Not sure you are totally with me on the barbs so I'll try to explain it different. I'm only talking about the block here and as you already have some barbs in it you might as well test it as it is.
Thinner won't definately be better, thicker won't definately be worse. It could depend on many factors of a given system, but my advice is to put together as it is and see what your max CPU temp is for a week or so, (log the results). Then test it with a restriction in the flow, (only slight), If the temps remain exactly the same then your flow is sufficient and fitting bigger barbs will either be a waste of time, or COULD make it perform worse.
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