Isn't it so that, under braking forces, the torque between the outer rim of the rotor and the hub compresses the leg and causes them to jack out?so it remains a mystery, at least to me, why they are not fitted that way round.
This holds the braking surface in tension, keeping it out and straight; working against it's tendency to collapse in and buckle under braking.
Look at all the current one piece rotor structures and directions. Tangential arms facing forward is definitely the consensus after years of bitter experience, lawsuits and testing.
The Hope rotors are pretty overbuilt, so a failure is unlikely (and AFAIK nobody has had trouble), but personally, I'd turn them around just to be on the safe side.
Hope authenticity pedants might point and stare, but it's only 12 screws, a few minutes. The braking's not going to get any worse, and it just might save your life.
All the best,