The new scheduling only has one war per month. That means for a particular boost, you only have the chance to get it once every 2 months. It doesn’t solve the issue on fiefdom dropping. If anything, it made it so much worse because now it makes it even even more important to drop fiefdom on a war you don’t want to fight so you can win the war you want to fight.
With the introduction of pro boost and now recently conquest boost, please consider converting war boost into elite boost, and change war structure. Instead of special war boost, make some special conditions in the war to spice things up.