Hey Welcome Eusahn!
Hmm..... it would help to know what board, boots, binding, stance width and angles your riding. A photo of your board can say alot.
From what I can see (and tell your film crew to get closer next time ) your not reaching as we would call it.......your bending at the waist and touching the snow to the side of you. "Reaching" is not the best term to try to emulate.....better word to visualize what you want your body to do is "extending" which is achieved after the turn is initiated....and your turning could be limited by your stance, binding angles, etc.
I'm sure many other people will chime in on this .....and as it seems to be softboot specific I'll let those Sages speak up!
But again welcome to the forum~