Love your builds Miko, Very creative.
I think the use of scales is an interesting way to evaluate the way a slot car handles. Do you think you can remeasure the weight with the guide on one scale and the rear wheels with the chassis level. This way it will take into account guide lead. I am thinking the front wheels do not have as much do with handling as the weight on the guide and its distance from the rear wheels.
I plan to get a set of scales myself to better understand what makes a good handling slot car. Where did you get yours and what do they cost? Thanks