As someone who has played Khergit/Khuzait for a very long time I have to agree that they are only really strong when the player joins their kingdom. It's so easy to imprison nearly the entire enemy kingdom as the player and have other lords do the "dirty work". As much as I love playing whilst using the classic Mongol tactic (mass rain of arrows into horse charges), it is currently too powerful. The fact that Khuzait noble T4 units will absolutely obliterate any non-Khuzait unit doesn't sit right with me. Polearms that can swing are currently devastating, when you add a charge bonus to that damage you will just oneshot anything that moves. In all of my Khuzait playthroughs I barely lose troops if I fight on favourable terrain, which you should be able to do since your entire army can easily consist of only mounted troops. IMO a good change would be to swap the Kheshig's (Steppe War) bow and the Khan's Guard's (Steppe Recurve) bow, give them piercing arrows whilst significantly reducing the damage output with polearm swings on horseback. I'm sure this has been debated before, haven't been on the forum for a long time.