Cora if you would convert half your wiz into archers/swordsmen/lance, I'd guarantee you can keep the castles... Those 4 castles you lost in 5 days you lost less than 1k units total, I had a bigger army coming out of initial protection than you had across all 4 of those battles combined. It's unrealistic to carry that level of magic and also be able to win battles. This doesn't have anything to do with the crime rate.
Jets problems are slightly different. Idk even know what his strategy is, it's very peculiar for undead, and he's had a ton of castle wins and losses - maybe only having built 2, which he lost in the fray. He got prere'd and failed a couple attacks that tipped the balance from gaining/losing to ending up at something like 8 castle wins and 10 losses, net deficit leaving it at 1... But, idk what Jets is doing. He's playing a fodder race with zero production capacity for that fodder, playing a race that doesn't need food yet has 2X more farms than guard houses... Doesn't make sense, makes for unrealistic expectations.