The kobuki base alone does not drift, so it is sensible the tilted inertia results in the drift. Needless to say I am able to hack my URDF by using a weightless superstructure, but I desired to deal with this in a far more real looking way. I tried all https://www.uk-exhibitionstands.co.uk/product-category/fabric-display-stands/fabric-pop-up-stands/