Buff mangudai/nerf Rus cav arch/make cost gold?

It’s a little silly that Rus cavalry archers beat them in everything except the ability to move and shoot. On top of that mangudai cost gold while Rus cav archers are only food and wood. Considering all of this I think mangudai should have a little better attack and armour.

EDIT: Or make Rus cav archers cost gold?