Re x10sl, like you run them on numerous 3 x9 without any probs and never at extreme angles. Im probably heavier than you, its all muscle i tell ya!!!!
Ive read that the 11sl is same width internally as 10 spd but is slightly narrower by having thinner side plates = weaker. And also read that the xx1 (11 spd) cassette has same spacing as 10 spd, it accomodates the extra big sprocket by overhanging the hub by the spokes so should work with 10 spd chain..... but i may have misinterpreted that.