I am a newbie
so take my advice with skepticism.
I also tried to work on my dynamic turns last weekend. Spent the whole weekend up at Snow Summit. Temperature is around 58 degrees, so it is patches of slush that turns to ice in late afternoon.
You seem to have the same problem that I have with the tendency of not angling the board enough when turning and results in having to slightly rudder the board. My problem is that I have the lazy toe, e.g. that I do not engage my toes enough and not bending my knees enough. Once I figured that out and started aggressively flexing my knees my turns became a lot tighter and I don't skid as much.
But I am a newbie
So I might just be completely wrong in regards to you.