Here is what I am thinking...if JayDee makes the holes deeper he will be giving up too much copper.
As for right now the copper is most likely transfering to the sides as well as through his holes, then being removed by the water.
For example...you will be removing heat at both 1/8th in and 1/16th in. You will want to maximize the amount of heat removed at the 1/16th in or deeper portion of your block.
If you can..make the holes smaller and deeper...this should maximize the amount of water/copper ratio and in return give you lower temps.
Tuff
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