i think buff has a pheomelanin diluter involved that turns the red/gold paler, maybe you could try incorporating a nice buff for that gene and see what happens?Casey et als
The issue of the dark blueness I think comes from melanizer genes from either the BR or from the Blue parent in LB matings. I've been test mating my blue foundation birds for both gold and for no melanotic genes for that reason. My results has been, unfortunately Silver Blues so far, but they have good blue coloration. Now if I can just get gold based blue rather than silver!
Dave