Hi Genny,
add via barel cracking;
plating uniformity;
keeping non-functional lands;
minimize number of prepreg layers;
increase hole plating thickness;
test plating quality/properties more often;
testing of coupons by IST or HATS;
moisture bake-out; 
choice of resin system.
My White Paper certainly would help and give you an understanding of the 
various issues.


Werner



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