The hub rule is arbitrary at best.
Get your body / back / legs in a comfortable / powerful position relative to the pedals (some like knee over center of pedal axel, but this is an arbitrary starting point as well...) and your saddle at the right height. Then work on your stem position - both up and out. Start with level with the saddle and work down from there. (or up, if you prefer)
As you gain or lose fitness you may raise / lower or change this position.
Personally I have my bars a bit below saddle height and I use the drops only on descents or if I'm trudging into the wind.
Comfort (for most) is king in LD events. A comfortable, non sore cyclist can keep moving up the course, and you'll spend less time off bike stretching and fussing with a sore back or neck.
I started last years brevet season with nearly a 4" drop to my bars. That crept up as the distances got longer, to a high of about 2" below my saddle. When I got a professional fitting done with my new bike we settled on just under an inch... its been comfortable for 6 centuries and long training rides.
So long. Been nice knowing you BF.... to all the friends I've made here and in real life... its been great. But this place needs an enema.