I understand what you are saying. I am lucky enough to have the 2 slings in the garage. The only difference between the the 2 is the SC. Each one has to be driven differently with the NA staying in the higher higher rpm range and the SC being able to stay in a higher gear, allowing it to pull longer through and out of the turns.
As well as running different tires, the SC has a larger diameter tire that effectively gives me higher gearing.
Crazy thing is I think I have found a way to get even more traction. (Coming soon)