I have found that a blade taken to as high a grit as possible gives a better etch. I etch in battery acid and usually for as long as it takes for me to get a deep etch. This will vary on how hard the steel is. Remember that when you etch the acid eats at the "softer" steel more than the nickel etc and this is what leaves you with high and low spots. Also, a blade that is really hard and not tempered properly will etch far more slowly than a softer more malleable blade, and this will also vary according to what steels you used in the mix.
I then use gun blue over the whole blade and very lightly sand with 1200# to highlight the high points and leave the low areas dark - this gives contrast. But on these two I did nothing but etch as I liked the outcome.
Also, I used 1080 and 15N20 here and 15N20 is nothing more than 1070 with nickel, so there is very little difference between the two steels. If you use steels with completely differing composition then you get a completely different outcome.