I have heard that breeding back to Splash can cause the lacing to deteriorate, I tend to breed blue to blue then every other year I chose a black laced hen with the best lacing and I breed my best laced blue boy to her. This way you keep and nice deep blue colour for the lacing and also maintain neat lacing.
It's common to see black laced hens with "double laced " feathers along their backs, male black laced can also carry the allele that causes the feathers on the back of the birds to appear double laced but, the double lacing effect can't be seen in male birds - this can be a problem if you breed a male black laced to a female blue laced because you run the risk of the offspring having double lacing or poor lacing on the feathers along their backs.
Therefore if you do breed back to black make sure you breed a male blue laced to a female black laced because you can select a black laced hen with no double lacing of the feathers- ensuring you produce chicks with the neatest lacing