This might sound impossible, but try making three turns for every mogul. Start by going at the first bump at an angle, make a turn across the front face. Next make a turn on the top. Finish by making a turn at an angle across the back. Occaisionaly you might actually accomplish three turns per bump, but the idea is to keep a neutral body position while keeping the board moving edge to edge (not carving necessarily, but keeping the the edge in contact with the snow, which keeps you in control).
Ideally you'd like to be fairly relaxed in the upper body and really do the work with your knees and ankles. Rotation of the upper body (or counter rotation) will make any rythm next to impossible.
Three turns per bumb, every bump, is tough, but with some paractice you'll find that two turns per bump consistently (one going up the front and one going the back), will lead to better speed control and significantly more enjoyment. If you can get three turns, I guarantee you'll be turnin' heads and gettin' cheers.