Great story.
I know my brother's Integra is considerably more agile on 205-section tires than mine is on 245-section tires; it's at least 400 lbs lighter, as well as lower and much more stiffly sprung with its modified suspension.
A slightly different angle: If you look at any two cars with vastly different curb weights that can achieve similar levels of handling performance, the heavier one always has MUCH wider and/or stickier tires.

I know my brother's Integra is considerably more agile on 205-section tires than mine is on 245-section tires; it's at least 400 lbs lighter, as well as lower and much more stiffly sprung with its modified suspension.
A slightly different angle: If you look at any two cars with vastly different curb weights that can achieve similar levels of handling performance, the heavier one always has MUCH wider and/or stickier tires.