Arn’t we supposed to have inside rear slip so that the outside rear is able to turn? As paul was saying tires generally want to go in a straight line even more so when they are connected by a solid axle. So it seems to me at least we would need to loosen the inside rear to turn the outside quicker.
That being said I remember my 5.5 briggs days where we all had g-man full body plastics and steering faring with lay-down or offset seats. Most of the time was because our track had more lefts then rights and also the aero draft effect.