I've always thought that since the ( _.90) super class guys need to have a degree in weather science to run the number consistently , the best way to even the field is to draw a random number within +/-.25 of the .90 standard for each race. Almost every car is capable of running the _.90 number, and 90 % of the participants can come within probably .05 of the index on their first hit of time trials, so why not give every race a moving target. Yes, it is still going to involve throttle stops, but at the very least, it's going to make everyone work a little bit harder to run closer to the index.