If you were previously breeding the Splash variant of the BLRW that would explain why you're getting dark chicks now, because you're breeding a Blue male over a Blue and Splash hens.
These pictures were taken of birds I got from McKinney and Govero 17 or 18 years ago and are long gone. Their type wasn't amazing, but you can see the color in them. The color is a bit wonky, because let's face it, we've come a long way in digital photography since then.
Splash BLRW hen:
Blue BLRW hen:
Splash BLRW pair with a Black BLRW in the background:
Blue BLRW pair and a dirty bottomed Splash BLRW hen:
