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Tried the B. Could JUST get i clearing but shifting was compromised. Might come down to the bike and hanger position.I used an XT mid cage. Didn't even have to wind the B-screw all the way (was close though) and it worked fine with 11-40.
With 10 speed Shimano you wind the B screw so that the jockey is as close as possible to the largest cog. The last time I used SRAM 10 speed you set it at about 5-6mm clearance. It is interesting though that 11 speed Shimano they have since gone to a 5-6mm clearance spec as well. This coincides with what I already did with my old 10 speed, where I wound it out by the same amount and it worked fine with the 40T.