I wondered if the bluexblue matings made a better splash.
My first batch of chicks was almost entirely from the splash rooster/black hens pen, and the blue chicks were very dark. I sold them all, but the woman lives close, so I will get to see how they grow out. My next 2 sets are a pretty even mix with the eggs from the black rooster over blue hens, so I'm curious to see how they compare
The blues from that mating may very well be dark also. Some may be too dark. I've had some that I thought were a dark blue end up being black and vice versa. Good luck with that. I think it all depends on how much melanizer the bird gets.