First of all, you are doing very well!.....and it looks like you are having tons of fun. way to go.
Lets stick with what Dobyman recommends with a focus on pole touches and pole use for a moment. This is definitely a good place for you to start. I agree that a good private lesson with an advanced skier (Heluva, are you volunteering?) will do wonders!.....
Think about the following basic ideas with regard to poles/arms/hands
Poles touches: the movements should come from wrist swings, not whole arm/shoulder swings. be disciplined but not rigid. No statues or poses! The arms and hands should have intent....that is moving to aid in timing and balance. The pole touches should be diagonally forward of the boots (away from the skis edge) and not get in the way of your turns so they have to be timed well. In your vid, this needs work.
seek symmetry. ( slow things down, choose easy terrain, ingrain the proper movement patterns and then speed things back up)
Arms: should stay in front of the body. period. elbows slightly ahead of the body, arms slightly wider than the elbows. Reach with the pole swings from the wrists.
Shoulders: should do their own thing as they are part of the upper body that is providing stability for the rest of the body to turn against.
Timing: This should feel natural on general terrain. (In moguls or steeps there are some differences that I will leave alone for now) The pole touches should be timed (again, in general) so that it helps draw you into your next turns. **POLES SHOULD ALWAYS BE SWINGING, lefffffffftttt, riiiiigggggghhhhhhtttt, leffffffftttt, riiiigggghhhhttt and touch down as each turn is getting started.
Pole length:
I noticed that your poles may be just a bit long....maybe. This might be why you feel the need to get so tall and settle back on your heels a bit between turns. Have that looked at.
Any desire to join the ski school there at the Peak?....
Keep at it.
slow it down to speed it back up.
lookin good, man
JP