It’s not just the angle but the dangle is just as important.Concur.
As to the bolt handle, mimic the AI. It's not just angle, but length as well. I personally feel, that putting the force for moving the bolt to the rear (and minimally offset from the longitudinal axis) makes the bolt movement "feel" smoother by not allowing a shooter to bind the bolt against the receiver wall. As we discussed earlier, I think this is why the "AI style" bolt handles are so popular with the Tikkas; they reduce the perpendicular leverage by the shooter when transitioning from unlocking the bolt to extracting (rearward movement) the case. As a result, the bolt operation just "feels" smoother. Essentially, you're pulling the bolt back, rather than dragging it back.
Again, just my personal thoughts on this matter.