Even if we do everything to avoid it, every once in a while we are forced to ski in crud. I'm not really sure of the correct definition to crud but in my book its any kind of snow that falls in the category between groomed and powder. Here is a video I made on the subject some years ago when I was forced to ski down some long and winding ski routes in St Anton in nasty chopped up snow conditions looking for bumps hoping for powder whishing I stayed on the groomer. Basically everyone was struggling including me but then I got my act together and stripped it all down to bare essentials. Luckily I had my cameraman with me to capture it on video. Note that this is maybe not the best way or anywhere close to perfectly perfected but hopefully it gives you some ide of how to turn a growing nightmare into a smooth and controlled ride.
The trick is to jump up in the air at turn initiation. Note that you should not jump up in the air in order to pivot your skis in a new skiing direction. You jump up to gain momentum. Use this momentum to force your way through the surface of chopped snow in order to steer your skis into the turn. I like to think of the "air" as "control". More air, more control. Once you feel safe and in control try to keep your skis on the snow while still jumping up. This is basic up-unweighting technique. Don't rush through the fall line. Keep your speed up. Keep moving. Don't stop. Use piles of snow and bumps in combination with leg extention to push you up in the air.