If you buy the Kuiu you’ll want the bigger size. The Kuiu will wear great on your chest even at the larger size, but ditto on the useless front zipper pocket. I’m convinced the only reason they did it was so they could add “front zipper pocket” to their list of marketing material. I took mine to Colorado on 3rd season mule deer 2 years ago, and got stopped by the game warden who was checking tags and hunter ed. I had both in that front zipper pocket. In order to get them out, I had to take the harness off and use my Multitool to reach in and pull out the license and hunters ed card. Totally ridiculous.
I just picked up some 11x B2’s from a member on here and have them in a Medium Enclosed Marsupial. It’s breaking in nicely, and bonus is I can actually use the front zipper pocket. So that’s great! That would be my recommendation, Medium enclosed Marsupial harness. Nothing against FHF personally, but there’s a reason their newest harness is basically just a straight up clone of the Marsupial, so I’d say just buy the original and go marsupial. But I doubt you’d be unhappy with the FHF.