Ultimately, it's how it feels for you with your own legs and saddle setback, no hip rocking. Methods are useful to start with, but they aren't absolutes, because there's no telling how toes down or not you will be pedaling. On a road bike, sometimes if you're not comfortable in the drops no matter what, it can because you're actually sitting too low and your legs come up too high. Also, when you are trying different heights, very often, you will automatically pedal more toes down as your raise the saddle, and that even invalidates the no hip rocking rule of thumb. However, pubic bone height minus 10 or 10.5 cm should be a pretty good height for you.