I don't know how you're planning to run this series, but I kinda hope you're doing different cars for each race? What I think would be cool is doing some races with "self-restricting" cars. What I mean by that is like using cars where you simply can't go POWWAHHHHHHH with it :P So like with the FXR you can put like 4k BHP in it without issues, and I was sticking 2k BHP in an FO8 earlier and would have been fine if I had my wheel
What I mean is stuff like having an "unlimited tweak race" with UFR/XFR or something, but force people to use road tyres. So that instantly limits people's power outputs (although you can still put a half decent amount of power down as it's so light) and you should end up with a close race. Or maybe FXR unlimited but force people to use R2 tyres