I'm not big on flemish strings, but I understand that one advantage is they can be adustable in length. I would get an adustable flemish string, play with the adjustments until you find the exact right length. Once you have determined that, measure the string for length and order an endless loop dacron B string exactly like you want it.
I also think the exact right brace height not necessarly as critcal a factor for the bow, as it is for the individual shooter. I know a bow will have a sweet spot, but that can vary from bow to bow of the exact same model. The individual shooter is constant to himself.