Thanks for the reply Mike.
Well by the end of the season last year I figured that our cinder surface was so bad that there was a .8 difference between that and all-weather, but the 2 second difference was just one day and I'm not sure exactly what happened.
Disregarding this one instance, if you had an athlete in this situation what would you do Mike? Or would you need to be watching them to check for inconsistent race distribution? By daily fluctuations in physical readiness do you mean not planning properly to be fresh for training/meets? Because I meant that within a single training session I can sometimes see a difference of up to .6 in short speed work.