Daan,

I'm sure in your mind the paste isn't the problem. Is it the usual
contamination or oxidation?

I would like to see some x-sections, both vertically and horizontally, of
the board to see if outgassing came from the filled and plated over holes.
50% voiding, though significant in terms of the solder joint, is not that
excessive relative to hole outgassing but I'd still like to see some
sections as this could be analog to hole wall outgassing in through holes.

Enjoy the adventure but hope it's not to much of a bad ride,

Earl

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