BTW Transamz9,
Instead of just taking my word for it, google sidewall stiffness and see what others say:
Tirerack:
"a "stiff" sidewall that could provide responsive handling and high-speed stability would also reduce ride comfort"
http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=22&Evo forums:
"You need some sidewall complacency for handling. Too stiff and the tread patch will not work effectively (keeping the car glued in turns). Too soft and steering response suffers."
http://forums.evolutionm.net/evo-tires-wheels-brakes-suspension-sponsored-tire-rack/563176-how-can-you-tell-if-tire-has-soft-sidewall-stiff-sidewall.htmlGrassroot:
"the sidewall will most likely be stiffer on the higher load rated tire"
"the heavier-rated tire is stiffer because of the extra material needed to contain the higher pressures that are associated with the higher load rating" - note, this is the exact point you're arguing against earlier
http://grassrootsmotorsports.com/forum/grm/tire-load-index-sidewall-stiffness/30646/page1/Sweedspeed:
"I went from 235/60/18 103H to 235/60/18 107V XL. Hoping to get some extra life with the stiffer sidewalls. Anyway, same size tire; is there any need to increase pressure due to the XL rating if I am not loading up the vehicle"
http://forums.swedespeed.com/showthread.php?169854-Tire-with-a-stiff-sidewallNot trying to win a pissing contest with ya, just want to enlighten where I can. Thousands of people don't chase for stiff sidewalls for nothing, if air pressure can compensate.