If what I'm getting from the Chicken Calculator is correct, then you'll get black chicks from the first crossing (males will be split lavender and chocolate and females will be split lavender)
http://kippenjungle.nl/kruising.html?mgt=E:E/E,Lav:lav/lav&fgt=E:E/E,Choc:choc/(choc)
If you cross one of those split roos back to the chocolate hen, you'll theoretically get 1/8 chocolate males and 1/8 chocolate split to lavender males (you'll have to breed them to figure out which ones are split and which ones aren't).
I'm sure @jeremy or @rockinpaints will correct me if I've screwed up the calculator or misinterpreted something.
I think we're going to have to go to Jeremy on this one. I am not sure because Lavender is a diluting gene. It works with black but I am not sure how it works with chocolate. I know it dilutes the orange/red in the partridge gene to the creamy isable and replaces the black with lavender. Interesting to know what it would do to chocolate.
Try it BrahmaCrazy

