Back to the Bode Miller video, a couple of things to point out....
Note the part where they say to commit to the outside ski. That means that he has very little weight on the inside ski.
Note how much he has both skis edged. Note that he has the skis on edge well before they reach the fall line.
Note that his leg bones aren't very far apart on the steep stuff. The inside leg is pretty much retracted to lessen weight on that ski, so the feet appear to be far apart, but he really doesn't have his legs far apart. You will have better balance on that outside ski and easier balance transfer to the other ski at the transition with the legs parallel.
Note that on the more aggressive turns how early his hips and shoulders turn to face the outside of the turn (called counter). This is more than just facing down the hill. The earlier the better, not wait and "ski into the counter."
Note how his body is slightly bent forward at the waist early in the turn to allow his legs to put more edge angle on the skis early in the turn while balancing with the upper body. This is called angulation.
Note how little his arms move for pole plants. I'd suggest moving the arms even less, with the arms held somewhat out, hands out wider than the elbows, inside arm forward and high, the outside arm back and low, and mainly use a flick of the wrist for the pole plant motion. If you let your outside arm wrap around your body and twist you toward the hill, you're doomed.
To keep your weight properly centered, pull both feet back during the transition between turns, and keep pulling the inside foot back during the turn. Forget the old canard about the angle across the ankles equaling the angle across the hip bones equaling the angle across the shoulders. Inside foot back, lots of counter in the hips & shoulders, and you'll ski better.
Here's a paradox for you. The more aggressively you ski the steeps, the more control you have to ski any speed you want. If you ski them timidly, you'll soon be out of control. Really get your head and shoulders down the hill ahead of your feet. They aren't, really, but it should feel like you're diving into a pool. Be very sure your shoulders tip down the hill, never back toward the hill. Be very sure your zipper is facing the outside of the turn, and the earlier in the turn the better.
I don't like the way Bode Miller skis. I feel that if he combined his amazing talent, his hard work, and very good technique like the Austrians and some others show, he'd be consistently unbeatable.