I make my own strings, so I can get about any configuration I need. The one I'm shooting is a 3 bundle, 9 strand string, with the loops padded to 18 strands of D97. It settles into the grooves nicely, and I think the tapered loops help reduce noise. I've been using this same combination for some time on all my bows that will handle low stretch string.
I'm not a fan of B50, but if it works for you, go with it. You will get a fair amount of stretch with it though. My experience has been it quits stretching and wears out at about the same time, lol.