Apart from what Machka says, also it is a good idea to run handlebars at the same height as the seat. My bikes generally have had that set-up for decades, as I see little point in having to lean forward and support the weight on my hands in contact with the bars.
Gee, I very rarely have used the deepest sections of road bars -- occasionally in strong wind, but not even fast downhills. Some of my bikes have been fitted with single-level time-trial-style bars -- my FG still is, and I have been considering using my two or three other similar bars on my other road bikes, as well..