My question of Castrol Edge 0W40 is why only TBN of 10.2?
When M1 5W50, 15W50, 0W40 are all above 11?
HTHS is not a problem, at least, it is the same as M1 0W40. I am guessing it will shear similarly as M1 0W40. You can search through the UOA here to get some ideas.
However, with $50 price...