To the first sentence: that would be for DRAG racing, not track/A-X, right?
To the second:

Larry
code5coupe

 

I have a buddy who works for Ford and we came to the agreement that since most folks(soccer moms especially) don't know how to drive a truck. With the Firstone tires at the proper pressures, the center of gravity was too high. So for the soccer moms to avoid flipping over, they lowered the tire pressures and effectively lowered the center of gravity. A better solution other than a complete redesign of teh vehicle would be driver education.
Teach these people that a Ford Explorer is not a car and handles differently than a car and can't be driven like a car around turns.

Instead they lower the psi recommendation and we all know soccer moms exceed the speed limit, put all that together and you have disaster, since it was the tire that failed, the tire company was blamed. Nevermind that it failed because the vehicle manufacturer gave bad advice. The tire faild and the media only wants to say it that way. I guess it's too much trouble to dig for the truth.
Same for the Suzuki Samurai. A greatvehicle, but gee, people were flipping them over, why? Because they drove them like they were cars. The Sami's are meant for slow offroading manuevers, not autocross and even the Jeeps that Consumer Reports tested flipped. It had nothing to do with the extremely large out riggers they attached to teh vehicle, if anything they helped the vehicles roll over, but since thy were there they didn't roll. Also how about GM trucks from 1974-1987 with the gas tanks on teh outside of the framerails? One guy has a gas tank explode and all trucks are now deemed dangerous. That simply isn't true, I know becuase my buddy got t-0boned by a motorcycle doing well over 100 mph and the bike punctured the gas tank. That truck is still in service today.
I'm getting off the subject here, but the bottom line is go by the manufacturers recommendation, but if it doesn't seem right, simply do as you have done and ask here.