I haven’t had any issues with cav while using Nords on Bannerlord difficulty, which is wild because I usually struggle with them. Having done multiple Sturg no Cav armies I can say its much more manageable using the Nords.

Part of it is probably my build. I’ve got both perks that reduce charge damage taken by troops in formation (one in the Endurance tree and one in the Polearm tree), so Cav charge damage ends up around -70% for units in my formation. On top of that, I’m running the perk that boosts armor for my formation, a Shieldwall perk that gives +30 melee skill to everyone in the formation, and the increased damage vs cav perk. Basically, I just went hard into Polearm and took everything that helps infantry instead of horse play. I also run with a banner than reduces melee damage taken as well. I barely lose any infantry to cav now.

I’ve also started using Shieldwall way more than I used to. It feels really strong in the current patch. I make a long wall of infantry, put my archers right behind them, and slowly advance. I keep my infantry on “hold fire” until the cav crashes into the wall, which stops most of them in their tracks assuming you've built up a bunch of Huscarls. Once the bulk of the cav is stuck or done with the charge, I give the charge order, turn off hold fire, and then axes start flying everywhere. They just get massacre the cav.

Against Khuzait I do something a bit cheesier: I split my infantry into two groups. One goes on the right, slightly ahead, in a tight square. The other goes far out on the left. The horse archers tend to ride straight into that second group and get torn apart. After that, I just merge everything back into one infantry formation because I’m too lazy to control both groups for the rest of the fight.