First thing youll wanna do is take down wen chou and yan liang, since theyre usually the ones triggering more spawns. Getting those bases under control especially the southern gate, will give you some breathing room before pushing forward. Going for the man-affinity weapon is a really solid choice here makes dealing with officers way easier when they keep showing up

Pretty important to understand you cant fully stop the spawns its part of the challenge but you can definitely control the flow. Try following those darker paths through xu province, makes it easier to catch officers before they group up with others. While youre doing this keep an eye on those mission objectives, since finishing stuff like rescuing allies or maintaining morale can actually slow down how quickly new officers appear

Something interesting about the whole thing running through castles and bases first usually messes with their spawn points enough to give you time to breathe between waves just dont forget to keep that morale up by taking down their supporters when you see them