oh ya... drill-bits are completely useless, for doing it this way.....
if the overlapping is such that the opening being formed between the 2 holes are not too big, (about 1 - 2 mm for a holesize of 5mm) then the Cu \ H2O ratio should still be exceptional.... The ratio is important, but what is much more important, is getting the pin shape right..... the resultant turbulence being created by a grid of properly shaped pins will instantly nullify any shortcomings as 'n result of a slight imbalance in the Cu/H2O ratio, up to a limit, of coarse.
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There is no Spoon....
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