I would think that the front brakes would come on before the rears, The large front reservoir moves fluid first, then the small rear reservoir, but I'm not finding that to be true. My rears come on before the fronts. What controls the order that the brakes engage? It does make some sense that there would be better control with the rears starting the slow down.
I have a stock system, with T in place of proportioning valve, and yes, I do have the lines connected correctly.