The kobuki foundation by yourself does not drift, so it makes sense that the tilted inertia causes the drift. Naturally I'm able to hack my URDF using a weightless superstructure, but I wanted to fix this in a more practical way. I attempted all I'm able to think about, and https://www.uk-exhibitionstands.co.uk/product/pop-up-stand-3-x-4-bundle-straight/