I agree, think Fleugs is doing a good join in Perdan as well now protecting the infil for instance (yes I'm serious).
But finding reasons for war isn't that hard in my opinion, however actually following through rather than being "oh but I could lose...mmm" is the real challenge. Also limited regions don't need to be "oh you harmed me, I will now take a duchy and try to destroy your realm" but could also be "oh your infil attacked me, I will raid the region of his Lord to the ground, that'll teach him!"