The solution to this and especially when you have multiple people in a group and so want to limit the number of holes, is to use onea single hand width trench instead individual catholes.
You start by making one cathole that is wider than long, and as it is used, you fill in and the dig to one one side using the diggings to cover up as needed. When you move on, you completely fill it in.
It should be no wider than a normal cathole and my understanding is that this is Forest Service's preferred method for larger groups instead of everyone digging individual catholes.