Surely riding ice or steep ice at that isn't especially different from any other (non-pow) riding...
keep a balanced position, keep you body inline with the board (quiet upper body) Let the board turn in good time, don't force it around - allow it to flow. Get more dynamic with your legs the steeper it is. This will help control your speed and allow you to turn through the fall line with easy confidence.
Soak up bumps with your legs.
Save rotation and other exaggerated movements for adjustment and finesse during the turn only.