Snowmiser, I wouldn't worry about your stance width. It will take care of itself as movements get more refined.
First I really like your posture over your skis. Nice movement over the center of your skis. Second, I like your range of motion in your joints as well.
How could we improve on this? First we could work on the rate and duration of the extension and flexion. Slow it down so that you are longest in the middle of your turn. this will require some mental discipline and practice. Secondly we need to apply the same rate and duration to your steering through use of leg rotation. You steer into your turn too quickly and then stop your leg steering early resulting in your upper body following your skis around through the turn. Try to get your leg steering to be continuous and deliberate through out the turn. The result of this should be that your are skiing into counter with your skis, feet and legs finishing farther across the hill than your pelvis and upper body. Your skis, feet, and legs should appear like windshield wipers, moving back and forth beneath a stable upper body.
The shoulder rotation and hand/arm position is an indicator of your leg rotation stalling out early in the turn. This is also where your slight stall between turns comes from IMO.
Some upper body discipline may help here too. Put some nice tension between your hands, arms, and core, (triangle of power one of my trainers calls it) as you ski and focus on your inside hand ending up somewhere in the vacinity of your ski tips as you turn. This may seem like the wrong end to work on and exageration at times, and it might very well be more counter than you need in every turn. Try it anyway though, to start reinforcing the separation between upper and lower body we need to develope at the hips. Even our low end demo's should exhibit some amount of counter that is developed at the hips.
Your pole swing should then reflect this amount of counter and not be so close to your outside ski tip, and the movements of the swing should help in directing your core more accurately into the next turn. Better flow from turn to turn.
Lastly, try to remember that we need the inside foot and leg to be active as well. Be mindfull here as well. Really, you have the moves, but they could be more effective through better use of duration, intensity, rate, and timing. Hope this makes sense to you, and isn't too much at once. Remember as well to choose one focus or movement at a time to work on, periodicly paying attention to how they relate to each other. Hopefully the end result will be more continuous movements, better separation between upper and lower body, resulting in more accurate and effective movements, and better flow. Let us know how things go for you.