I have two AWs I still plan on removing, but I am doing it more because they are not much use to my city in general, rather than because of the tournament. Remember that AW levels, and all the rest, only increase your squad sizes and have no impact on the actual difficulty of the fights. So if you can easily make the troops, there is no reason to change anything. Each star of each province has a set difficulty that is the same for a chapter 1 player or for a chapter 17 player, so what also matters is what chapter you are in and how many different 3-star troops you have access to.