Yacoubs chart was done at 109 Degrees F and Zo's was at 84 Degrees F. If you tried to plug those two into the DynoJet computer it would not be accurate for anything different then 25 degrees.
Plus Yacoub's car was set at 17 Degrees timing to be used with pump gas and Zo is set at 20+ degrees timing to be used with race gas only. This will affect the spool up just as much as the cooler air temps.
All and all though I am glad people are starting to push the limits again since Yacoub and Pete set the goals over a year and a half ago.