I have read all the same books. the problem with authors is most of the tend to quote the accepted norms. Do you breed blue birds at all?That's very interesting. Those percentages were what I've read in every article or book on creating and maintaining blue birds of any species. And they all state that you can't get blue to breed blue consistently. Obviously you've figured out something genetically different for your birds, so congratulations.
As to the rooster's chest, I know BLR Wyandotte males have lacing on the chest. However, is this acceptable in the Barnevelder, or is the solid blue chest preferred?
Sorry I known practically nothing about wyandottes except i bred my silver laced barnevelders from silver laced wyandottes, both bantam and large fowl.
Interestingly i have bred Andalusians for several years and have never had a splash, only blue and black from a pair and a trio of blue's. the problem with gene's is they do not always express themselves completely. the "blue " gene is a mutation of the black but it is hugely more complicated because there are many more genes involved. .