Sorry, but I've never heard of such thing. A crockpot is moist cooking in a sealed pot and does not need to have any liquid added, let alone filling 2/3 full, since the food itself provides the liquid. Most often the liquid added is for flavoring, such as BBQ sauce.
My chicken wings get placed in the crockpot frozen with the sauce and spices. That's all. I guess "soft and slimy" is the word for cooked to fall-off-the-bone-perfection and covered with BBQ sauce.
If one wants dry wings you can use balls of aluminum foil on the bottom of the crockpot to keep the wings out of the liquid, and maybe use a dry rub to give you a roasted chicken wing.
A crockpot is our friend.